By Harań G.   Hirschfeld P.J.   Sigrist M.   in Journal of Low Temperature Physics

ISSN:0022-2291|111|1-2|73-98

Springer Publishing Company ‎(1998)‎

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By Andersen B. M.   Graser S.   Hirschfeld P. J.   in EPL (EUROPHYSICS LETTERS)

ISSN:0295-5075|97|4|47002-47002

Edp Sciences‎(2012)‎

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