作者单位：
Laboratory of Mechanics, Department of Physics, Faculty of Science, University of Yaounde I,P.O. Box 812, Yaounde, Cameroon
[1]
Condensed Matter Laboratory, Department of Physics, Faculty of Science, University of Douala,P.O. Box 24157, Douala, Cameroon
[2]
发布时间
2013-11-20
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