Document Type: Research Paper
Authors
1 Department of Physics, Faculty of Science, The University of Ngaound'er'e, P.O. Box 454, Ngaound'er'e, Cameroon
2 ECS-Lab, EA3649, ENSEA, Cergy Cedex, Cergy--Pontoise 95014, France, Laboratoire QUARTZ EA 7393
Abstract
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