By Csikós B.   Hraskó A.   in Periodica Mathematica Hungarica

ISSN:0031-5303|39|1-3|201-211

Springer Publishing Company ‎(2000)‎

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By Hraskó P.   Harskó P.   in Acta Physica Hungarica A

ISSN:1219-7580|9|2-3|187-192

Akademiai Kiado‎(1999)‎

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