By Klier J.   Günzler T.   Würl A.   Leiderer P.   Mistura G.   Teske E.   Wyder P.   Shikin V.   in Journal of Low Temperature Physics

ISSN:0022-2291|122|3-4|451-458

Springer Publishing Company ‎(2001)‎

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By Gänzler T.   Volkwein S.   Weiser M.   in Optimization Methods and Software

ISSN:1055-6788|21|6|869-887

Taylor & Francis Ltd‎(2006)‎

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