By Elshehawey E F   Eldabe N T   Elbarbary E M   Elgazery N S   in Canadian Journal of Physics

ISSN:1208-6045|82|9|701-715

NRC Research Press‎(2004)‎

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By Elshehawey E.F.   Elbarbary E.M.E.   Afifi N.A.S.   El-Shahed M.   in International Journal of Theoretical Physics

ISSN:0020-7748|39|1|183-188

Springer Publishing Company ‎(2000)‎

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