2017 Impact factor 2.240

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Editor-in-Chief
Paolo Biscari
The authors wish to thank the anonymous reviewers for their helpful comments and suggestions. They are also grateful to EPJP for their corrections pertaining to the English language.

E. Tala-Tebue, University of Dschang, Bandjoun, Cameroon

ISSN: 2190-5444 (Electronic Edition)

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