By Malov D. E.   Umar A. S.   Ernst D. J.   in Acta Physica Hungarica A

ISSN:1219-7580|11|3-4|239-258

Akademiai Kiado‎(2000)‎

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By Güçlü M.C.   Li J.   Umar A.S.   Ernst D.J.   Strayer M.R.   in Annals of Physics

ISSN:0003-4916|272|1|7-48

Elsevier‎(1999)‎

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