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ISSN:0020-7748|39|12|2837-2851

Springer Publishing Company ‎(2000)‎

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By Yang G-H.   Zhang H.   Duan Y-S.   in International Journal of Theoretical Physics

ISSN:0020-7748|41|6|991-1005

Springer Publishing Company ‎(2002)‎

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By Duan Y.-s.   Liu X.   Zhang H.   in Annals of Physics

ISSN:0003-4916|308|2|493-501

Elsevier‎(2003)‎

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