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Low-temperature heat capacity and absolute entropy of yttrium(III) bromide (YBr3)

K Burkmann, F Habermann, R Gumeniuk, F Mertens

Zeitschrift für Naturforschung B

 

Thermodynamic and kinetic study of the thermal dehydrogenation of Sr (AlH4) 2 taking into account the by-products NaCl and LiCl

F Habermann, K Burkmann, J Kraus, B Störr, J Seidel, J Kortus, ...

Journal of Alloys and Compounds 980, 173476

 

Thermoelectric performance of indium-rich thiospinels In1− y□ yIn2S4− xTex (y≈ 0.16, 0.22 and x≈ 0.1, 0.2)

E Zuñiga-Puelles, A Özden, V Pacheco, L Akselrud, R Cardoso-Gil, ...

Journal of Alloys and Compounds 976, 173055

 

Graphene Magnetoresistance Control by Photoferroelectric Substrate

K Maity, JF Dayen, B Doudin, R Gumeniuk, B Kundys

ACS nano

 

Heat Capacity Function, Enthalpy of Formation and Absolute Entropy of Mg(AlH4)2

F Habermann, A Wirth, K Burkmann, B Störr, J Seidel, R Gumeniuk, ...

ChemPhysChem 25 (2), e202300748

 

Magnetism, electrical and thermal transport in R2Ni5C3 (R= La-Nd, Sm, Gd, Tb)

V Levytskyi, V Babizhetskyy, O Isnard, R Gumeniuk

Journal of Alloys and Compounds 969, 172411

 

: Two-gap superconductor with a complex Fermi surface

R Gumeniuk, V Levytskyi, B Kundys, A Leithe-Jasper

Physical Review B 108 (21), 214515

 

Single Wavelength Operating Neuromorphic Device Based on a Graphene–Ferroelectric Transistor

K Maity, JF Dayen, B Doudin, R Gumeniuk, B Kundys

ACS Applied Materials & Interfaces 15 (48), 55948-55956

 

Thermoelectric properties and scattering mechanisms in natural PbS

E Zuñiga-Puelles, V Levytskyi, A Özden, T Gürel, N Bulut, C Himcinschi, ...

Physical Review B 107 (19), 195203

 

Thermal conductivity and phonon anharmonicity of chemical vapor transport grown and mineral–FeS2 single crystals: An optothermal Raman study

A Özden, E Zuñiga‐Puelles, J Kortus, R Gumeniuk, C Himcinschi

Journal of Raman Spectroscopy 54 (1), 84-92

Incommensurate and multiple- magnetic misfit order in the frustrated quantum spin ladder material antlerite 

AA Kulbakov, E Sadrollahi, F Rasch, M Avdeev, S Gaß, LTC Bohorquez, ...

Physical Review B 106 (17), 174431

 

Low thermal conductivity in bournonite : A comprehensive study

E Zuñiga-Puelles, R Cardoso-Gil, A Özden, N Bulut, V Svitlyk, ...

Physical Review B 106 (19), 195201

 

Chemical Bonding in the Intermetallic Compounds LaBeGe and ThBeGe

M Kohout, R Gumeniuk, A Leithe‐Jasper

European Journal of Inorganic Chemistry 2022 (29), e202200383

 

Crystal, electronic structure and physical properties of U3Rh4Ge13 and Th2Rh3Ge5

V Levytskyi, E Svanidze, A Leithe-Jasper, R Gumeniuk

Journal of Alloys and Compounds 911, 165017

 

Coupled frustrated ferromagnetic and antiferromagnetic quantum spin chains in the quasi-one-dimensional mineral antlerite (OH)

AA Kulbakov, DY Kononenko, S Nishimoto, Q Stahl, AM Chakkingal, ...

Physical Review B 106 (2), L020405

 

Pressure Tuning of Superconductivity of LaPt4Ge12 and PrPt4Ge12 Single Crystals

GA Lombardi, K Mydeen, R Gumeniuk, A Leithe-Jasper, W Schnelle, ...

Materials 15 (8), 2743

 

Photovoltaic‐ferroelectric materials for the realization of all‐optical devices

A Makhort, R Gumeniuk, JF Dayen, P Dunne, U Burkhardt, M Viret, ...

Advanced Optical Materials 10 (3), 2102353

 

Supplemental Material to:" Coupled frustrated ferromagnetic and antiferromagnetic quantum spin chains in the quasi-one-dimensional mineral antlerite Cu3 SO4 (OH) 4"

AA Kulbakov, DY Kononenko, S Nishimoto, Q Stahl, ...

American Physical Society

 

Superconductivity of structurally disordered Y 5 Ir 6 Sn 18

V Levytskyi, W Carrillo-Cabrera, L Akselrud, B Kundys, A Leithe-Jasper, ...

Dalton Transactions 51 (26), 10036-10046

 

Composition dependent polymorphism and superconductivity in Y 3+ x {Rh, Ir} 4 Ge 13− x

M Feig, W Carrillo-Cabrera, M Bobnar, P Simon, C Curfs, V Levytskyi, ...

Dalton Transactions 51 (12), 4734-4748

Sc3Ir4Si13+x and Sc4Ir7Ge6 – the perovskite-related crystal structures

V Levytskyi, J Wagler, C Hennig, M Feig, T Weigel, A Leithe-Jasper, ...

Zeitschrift für Kristallographie-Crystalline Materials 236 (11-12), 313-323

 

Thermoelectricity and electronic properties of 

S Flipo, H Rosner, M Bobnar, KO Kvashnina, A Leithe-Jasper, ...

Physical Review B 103 (19), 195121

 

Mn-for-Fe substitution in Fe1-xMnxIn2S4 thiospinel–Crystal structure and thermoelectric properties

P Wyżga, I Veremchuk, P Koželj, A Leithe-Jasper, R Gumeniuk

Journal of Physics and Chemistry of Solids 152, 109984

 

Ultra-high strength Co–Ta–B bulk metallic glasses: Glass formation, thermal stability and crystallization

J Wang, I Kaban, V Levytskyi, R Li, J Han, M Stoica, R Gumeniuk, ...

Journal of Alloys and Compounds 860, 158398

 

Electrical and thermal transport properties of natural and synthetic FeAsxS2-x (x≤ 0.01)

E Zuñiga-Puelles, R Cardoso-Gil, M Bobnar, I Veremchuk, G Heide, ...

Journal of Physics and Chemistry of Solids 150, 109809

 

Incommensurate quantum magnetism and multiple-q magnetic order in synthetic antlerite, Cu3SO4 (OH) 4

J Litterst, H Poddig, D Inosov, J Geck, I Puente-Orench, D Peets, ...

Galoá

 

Valence fluctuations in the 3D+ 3 modulated Yb 3 Co 4 Ge 13 Remeika phase

M Feig, L Akselrud, M Motylenko, M Bobnar, J Wagler, KO Kvashnina, ...

Dalton Transactions 50 (38), 13580-13590

 

Crystal, electronic and magnetic structures of a novel series of intergrowth carbometalates R 4 Co 2 C 3 (R= Y, Gd, Tb)

V Levytskyi, O Isnard, RK Kremer, V Babizhetskyy, B Fontaine, ...

Dalton Transactions 50 (12), 4202-4209

 

Improving thermoelectric performance of indium thiospinel by Se-and Te-substitution

P Wyżga, S Grimm, V Garbe, E Zuniga-Puelles, C Himcinschi, ...

Journal of Materials Chemistry C 9 (11), 4008-4019

Anisotropic superconductivity and quantum oscillations in the layered dichalcogenide 

M Feig, M Baenitz, M Bobnar, K Lüders, M Naumann, W Schnelle, ...

Physical Review B 102 (21), 214501

 

Crystal Structure and Physical Properties of the Cage Compound Hf2B2–2δIr5+δ

O Sichevych, S Flipo, A Ormeci, M Bobnar, L Akselrud, Y Prots, ...

Inorganic Chemistry 59 (19), 14280-14289

 

Polar structure formation in solid solution of strontium-substituted fluorapatite–gelatin composites: from structural and morphogenetic aspects to pyroelectric properties

J Knaus, M Sommer, P Duchstein, R Gumeniuk, L Akselrud, S Sturm, ...

Chemistry of Materials 32 (19), 8619-8632

 

Ternary MIn2S4 (M = Mn, Fe, Co, Ni) Thiospinels – Crystal Structure and Thermoelectric Properties

P Wyżga, I Veremchuk, M Bobnar, C Hennig, A Leithe‐Jasper, ...

Zeitschrift für anorganische und allgemeine Chemie 646 (14), 1091-1098

 

Conventional isotropic -wave superconductivity with strong electron-phonon coupling in 

M Feig, W Schnelle, A Maisuradze, A Amon, C Baines, M Nicklas, S Seiro, ...

Physical Review B 102 (2), 024508

 

Structure variations within RSi2 and R2Si3 silicides. Part II. Structure driving factors

M Nentwich, M Zschornak, M Sonntag, R Gumeniuk, S Gemming, ...

Acta Crystallographica Section B: Structural Science, Crystal Engineering …

 

Structural peculiarities and thermoelectric study of iron indium thiospinel

P Wyżga, I Veremchuk, M Bobnar, P Koželj, S Klenner, R Pöttgen, ...

Chemistry–A European Journal 26 (23), 5245-5256

 

Structure variations within RSi2 and R2TSi3 silicides. Part I. Structure overview

M Nentwich, M Zschornak, M Sonntag, R Gumeniuk, S Gemming, ...

Acta Crystallographica Section B: Structural Science, Crystal Engineering …

 

Electronic and Vibrational Properties of the Superconducting LaPt4Ge12 skutterudite

MR Cantarino, FA Garcia, RL Serrano, R Gumeniuk, W Schnelle, ...

 

Crystal structure, phase transition and properties of indium (iii) sulfide

P Wyżga, W Carrillo-Cabrera, L Akselrud, I Veremchuk, J Wagler, ...

Dalton Transactions 49 (44), 15903-15913

 

Crystal structure, chemical bonding, and electrical and thermal transport in Sc 5 Rh 6 Sn 18

M Feig, L Akselrud, W Schnelle, V Dyadkin, D Chernyshov, A Ormeci, ...

Dalton Transactions 49 (20), 6832-6841

CeMo2B5: A New Type of Arrangement of Puckered Boron Hexagonal Rings

S Flipo, M Kohout, F Roth, T Weigel, W Schnelle, M Bobnar, A Ormeci, ...

European Journal of Inorganic Chemistry 2019 (31), 3572-3580

 

Crystal structure and superconducting properties of Sc5Ir6Sn18

V Levytskyi, M Feig, L Akselrud, W Schnelle, A Leithe-Jasper, V Dyadkin, ...

Journal of Physics: Condensed Matter 31 (44), 445603

 

Fermi surface studies of the skutterudite superconductors  and 

B Bergk, J Klotz, T Förster, R Gumeniuk, A Leithe-Jasper, V Lorenz, ...

Physical Review B 99 (24), 245115

 

The crystal structure of visible light absorbing piezoelectric semiconductor SrNb 2 V 2 O 11 revisited: high-resolution X-ray diffraction, vibrational spectroscopy and …

IV Odynets, S Khainakov, S Garcia-Granda, R Gumeniuk, M Zschornak, ...

Journal of Materials Chemistry C 7 (18), 5497-5505

 

Indium thiospinel In 1− x□ x In 2 S 4–structural characterization and thermoelectric properties

P Wyżga, I Veremchuk, C Himcinschi, U Burkhardt, W Carrillo-Cabrera, ...

Dalton Transactions 48 (23), 8350-8360

 

Overview of Experimental Results on Filled Skutterudites with Pt-Ge framework

R Gumeniuk, W Schnelle, A Leithe-Jasper, Y Grin

APS March Meeting Abstracts 2019, X36. 002

 

The heat capacity and entropy of the four lithium stannides Li17Sn4, Li7Sn2, Li13Sn5 and Li7Sn3 in the temperature range (2 to 865) K

F Taubert, J Seidel, R Hüttl, M Bobnar, R Gumeniuk, F Mertens

The Journal of Chemical Thermodynamics 130, 119-128

 

Structural stability and thermoelectric performance of high quality synthetic and natural pyrites (FeS 2)

E Zuñiga-Puelles, R Cardoso-Gil, M Bobnar, I Veremchuk, C Himcinschi, ...

Dalton Transactions 48 (28), 10703-10713

Superconductivity and magnetism in noncentrosymmetric  and 

M Feig, M Nicklas, M Bobnar, W Schnelle, U Schwarz, A Leithe-Jasper, ...

Physical Review B 98 (18), 184516

 

Uniaxial ferromagnetism of local uranium moments in hexagonal UBeGe

R Gumeniuk, AN Yaresko, W Schnelle, M Nicklas, KO Kvashnina, ...

Physical Review B 97 (17), 174405

 

Cluster Formation in the Superconducting Complex Intermetallic Compound Be21Pt5

A Amon, A Ormeci, M Bobnar, LG Akselrud, M Avdeev, R Gumeniuk, ...

Accounts of Chemical Research 51 (2), 214-222

 

Noncentrosymmetric superconductor BeAu

A Amon, E Svanidze, R Cardoso-Gil, MN Wilson, H Rosner, M Bobnar, ...

Physical Review B 97 (1), 014501

 

The heat capacity and entropy of the metastable lithium silicide Li15Si4 in the temperature range (2 to 615) K

F Taubert, J Seidel, R Hüttl, M Bobnar, R Gumeniuk, F Mertens

The Journal of Chemical Thermodynamics 116, 323-329

 

Structural and physical properties of Remeika phases

R Gumeniuk

Handbook on the Physics and Chemistry of Rare Earths 54, 43-143

 

Ferromagnetism of local uranium moments in UBeGe

A Leithe-Jasper, R Gumeniuk, W Schnelle, M Nicklas, A Yaresko, ...

APS March Meeting Abstracts 2018, P23. 004

Two-gap superconductivity in Ag1-x Mo6S8 Chevrel phase.

M Feig, M Bobnar, I Veremchuk, C Hennig, U Burkhardt, R Starke, ...

Journal of physics. Condensed Matter: an Institute of Physics Journal 29 (49 …

 

Thermodynamic characterization of lithium monosilicide (LiSi) by means of calorimetry and DFT-calculations

F Taubert, S Schwalbe, J Seidel, R Hüttl, T Gruber, R Janot, M Bobnar, ...

International Journal of Materials Research 108 (11), 942-958

 

Multiscale characterization of 13C-enriched fine-grained graphitic materials for chemical and electrochemical applications

VO Koroteev, W Münchgesang, YV Shubin, YN Palyanov, PE Plyusnin, ...

Carbon 124, 161-169

 

Tuning a sign of magnetoelectric coupling in paramagnetic NH2(CH3)2Al1−xCrx(SO4)2 × 6H2O crystals by metal ion substitution

V Kapustianyk, Y Eliyashevskyy, Z Czapla, V Rudyk, R Serkiz, ...

Scientific reports 7 (1), 14109

 

Structure variations within certain rare earth disilicides

M Nentwich, M Zschornak, M Sonntag, R Gumeniuk, S Gemming, ...

Acta Crystallographica Section A: Foundations and Advances 73, C287-C287

 

Thermoelectric properties of natural chalcopyrite from Zacatecas, Mexico

P Wyżga, M Bobnar, C Hennig, A Leithe‐Jasper, T Mori, R Gumeniuk

Zeitschrift für anorganische und allgemeine Chemie 643 (13), 858-863

 

Coexistence of magnetic order and valence fluctuations in the Kondo lattice system 

MB Gamża, R Gumeniuk, U Burkhardt, W Schnelle, H Rosner, ...

Physical Review B 95 (16), 165142

 

ThPt3+xBe (x = 0.08): Crystal Structure and Physical Properties

R Gumeniuk, M Kohout, W Schnelle, U Burkhardt, M Zschornak, ...

European Journal of Inorganic Chemistry 2017 (1), 179-185

 

Superconductivity in TaSnS2

M Feig, R Gumeniuk, M Bobnar, W Schnelle, I Veremchuk, S Medvediev, ...

Verhandlungen der Deutschen Physikalischen Gesellschaft

 

Hierarchical and chemical space partitioning in new intermetallic borides MNi 21 B 20 (M= In, Sn)

FR Wagner, Q Zheng, R Gumeniuk, D Bende, Y Prots, M Bobnar, DL Hu, ...

Dalton Transactions 46 (39), 13446-13455

 

Crystal structure and thermoelectric properties of some indium-based thiospinels

P Wyzga, I Veremchuk, M Bobnar, A Leithe-Jasper, T Weigel, ...

Verhandlungen der Deutschen Physikalischen Gesellschaft

Optical writing of magnetic properties by remanent photostriction

V Iurchuk, D Schick, J Bran, D Colson, A Forget, D Halley, A Koc, ...

Physical review letters 117 (10), 107403

 

Superconducting gap structure of the skutterudite  probed by specific heat and thermal transport

H Pfau, M Nicklas, U Stockert, R Gumeniuk, W Schnelle, A Leithe-Jasper, ...

Physical Review B 94 (5), 054523

 

Synthesis, crystal structure, and physical properties of a new boride Ga2Ni21B20 with a modified Zn2Ni21B20-type structure

Q Zheng, R Gumeniuk, W Schnelle, Y Prots, U Burkhardt, A Leithe-Jasper

Solid State Sciences 55, 93-97

 

Kondo effect and thermoelectric transport in CePd3Bex

R Gumeniuk, W Schnelle, KO Kvashnina, A Leithe-Jasper

Journal of Physics: Condensed Matter 28 (16), 165603

 

Valence fluctuations of europium in the boride Eu4Pd29+ xB8

R Gumeniuk, W Schnelle, MA Ahmida, MM Abd-Elmeguid, KO Kvashnina, ...

Journal of Physics: Condensed Matter 28 (11), 115601

 

Ternary borides Nb₇Fe₃B₈ and Ta₇Fe₃B₈ with Kagome-type iron framework

Q Zheng, R Gumeniuk, H Borrmann, W Schnelle, AA Tsirlin, H Rosner, ...

Dalton Transactions 45 (23), 9590-9600

 

Crystal Structure, Magnetic, Electronic, and Thermal Transport Properties of Ternary Compounds REReB4 (RE = Ce, Gd–Er, Yb)

M Abramchuk, W Schnelle, I Veremchuk, A Leithe‐Jasper, Y Grin, ...

European Journal of Inorganic Chemistry 2016 (1), 161-168

 

Ternary borides Nb 7 Fe 3 B 8 and Ta 7 Fe 3 B 8 with Kagome-type iron framework

Q Zheng, R Gumeniuk, H Borrmann, W Schnelle, AA Tsirlin, H Rosner, ...

Dalton Transactions 45 (23), 9590-9600

 

AlPd 15 B 7: a new superconducting cage-compound with an anti-Yb 3 Rh 4 Sn 13-type of structure

Q Zheng, W Schnelle, Y Prots, M Bobnar, U Burkhardt, A Leithe-Jasper, ...

Dalton Transactions 45 (9), 3943-3948

 

Valence fluctuations in the boride Eu_4Pd_2_9_+ _xB_8

R Gumeniuk, W Schnelle, A Tsirlin, A Leithe-Jasper, C Geibel, M Ahmida, ...

Verhandlungen der Deutschen Physikalischen Gesellschaft

 

A new superconducting beryllium platinide

A Amon, LG Akselrud, M Bobnar, M Avdeev, R Gumeniuk, ...

Wiley

 

Coexistence of magnetic order and valence fluctuations in a heavy fermion system Ce_2Rh_3Sn_5

M Gamza, R Gumeniuk, W Schnelle, U Burkhardt, H Rosner, A Slebarski

Verhandlungen der Deutschen Physikalischen Gesellschaft

Weak interband-coupling superconductivity in the filled skutterudite 

JL Zhang, GM Pang, L Jiao, M Nicklas, Y Chen, ZF Weng, M Smidman, ...

Physical Review B 92 (22), 220503

 

Synthesis, crystal structure and properties of the new superconductors TaRuB and NbOsB

Q Zheng, R Gumeniuk, H Rosner, W Schnelle, Y Prots, U Burkhardt, ...

Journal of Physics: Condensed Matter 27 (41), 415701

 

ThPt2: A New Representative of Close Packed Tetragonal Structures

R Gumeniuk, W Schnelle, U Burkhardt, H Borrmann, M Nicklas, A Ormeci, ...

Inorganic Chemistry 54 (13), 6338-6346

 

Magnetic and transport properties of structural variants of Remeika phases:  and 

R Gumeniuk, KO Kvashnina, W Schnelle, A Leithe-Jasper, Y Grin

Physical Review B 91 (9), 094110

 

Chemical Physics and Properties of ThPt2

A Leithe-Jasper, R Gumeniuk, W Schnelle, M Nicklas, Y Grin

APS March Meeting Abstracts 2015, M33. 001

 

Intermetallic germanides with non-centrosymmetric structures derived from the Yb 3 Rh 4 Sn 13 type

R Gumeniuk, M Schöneich, KO Kvashnina, L Akselrud, AA Tsirlin, ...

Dalton Transactions 44 (12), 5638-5651

Crystal structure and physical properties of {Th, U}{sub 3} Ir {sub 4} Ge {sub 13}

R Gumeniuk, W Schnelle, H Borrmann, U Burkhardt, A Leithe-Jasper, ...

 

Crystal structure and physical properties of {Th,U}3Ir4Ge13

R Gumeniuk, W Schnelle, H Borrmann, U Burkhardt, A Leithe-Jasper, ...

 

Chemical Physics of ThPt2

A Leithe-Jasper, R Gumeniuk, W Schnelle, M Kohout, M Nicklas, Y Grin

APS March Meeting Abstracts 2014, Q43. 002

 

Structure variations within certain rare earth-disilicides

M Nentwich, M Zschornak, M Sonntag, R Gumeniuk, S Gemming, ...

ACTA CRYSTALLOGRAPHICA A-FOUNDATION AND ADVANCES 70, C287-C287

Unconventional magnetism in multivalent charge-ordered YbPtGe probed by Pt- and Yb-NMR

R Sarkar, R Gumeniuk, A Leithe-Jasper, W Schnelle, Y Grin, C Geibel, ...

Physical Review B 88 (20), 201101

 

Y {sub 3} Pt {sub 4} Ge {sub 13}: a superconductor with non-centrosymmetric crystal structure

R Gumeniuk, M Nicklas, L Akselrud, W Schnelle, U Schwarz, A Tsirlin, ...

Verhandlungen der Deutschen Physikalischen Gesellschaft

 

YPtGe: A superconductor with a noncentrosymmetric crystal structure

R Gumeniuk, M Nicklas, L Akselrud, W Schnelle, U Schwarz, AA Tsirlin, ...

Physical Review B 87 (22), 224502

 

Multiband superconductivity in PrPtGe single crystals

JL Zhang, Y Chen, L Jiao, R Gumeniuk, M Nicklas, YH Chen, L Yang, ...

Physical Review B 87 (6), 064502

 

Superconducting properties of the filled skutterudite LaPt4Ge12 probed by thermal conductivity

H Pfau, U Stockert, R Gumeniuk, W Schnelle, H Rosner, M Nicklas, ...

Verhandlungen der Deutschen Physikalischen Gesellschaft

YbPtGe: A multivalent charge-ordered system with an unusual spin pseudogap

R Gumeniuk, R Sarkar, C Geibel, W Schnelle, C Paulmann, M Baenitz, ...

Physical Review B 86 (23), 235138

 

Charge-Doping-Driven Evolution of Magnetism and Non-Fermi-Liquid Behavior in the Filled Skutterudite 

M Nicklas, S Kirchner, R Borth, R Gumeniuk, W Schnelle, H Rosner, ...

Physical Review Letters 109 (23), 236405

 

Superconducting parameters of BaPtAuGe filled skutterudite

A Maisuradze, R Gumeniuk, W Schnelle, M Nicklas, C Baines, ...

Physical Review B 86 (17), 174513

 

Publisher's Note: Ferromagnetism and superconductivity in CeFeAsPO () [Phys. Rev. B 86, 020501(R) (2012)]

A Jesche, T Förster, J Spehling, M Nicklas, M de Souza, R Gumeniuk, ...

Physical Review B 86 (1), 019903

 

TM7TM6B8 (TM = Ta, Nb; TM′ = Ru, Rh, Ir): New Compounds with [B6] Ring Polyanions

Q Zheng, M Kohout, R Gumeniuk, N Abramchuk, H Borrmann, Y Prots, ...

Inorganic Chemistry 51 (14), 7472-7483

 

Ferromagnetism and superconductivity in CeFeAsO ()

A Jesche, T Förster, J Spehling, M Nicklas, M De Souza, R Gumeniuk, ...

Physical Review B 86 (2), 020501

 

A combined experimental and theoretical de Haas-van Alphen study on PrPt {sub 4} Ge {sub 12}

V Petzold, R Gumeniuk, A Leithe-Jasper, W Schnelle, M Nicklas, J Grin, ...

Verhandlungen der Deutschen Physikalischen Gesellschaft