C.A. Okezie , N.U. Inyang and Amaechi
Dje Koffi Marcellin , Djeni N`Dede Theodore , Toka Marie and Aka Solange
Gerogiannaki-Christopoulou Maria , T. Masouras , I. Provolisianou-Gerogiannaki and M. Polissiou
M. Gerogiannaki-Christopoulou , M. Polissiou , P. Tarantilis , I. Provolisianou-Gerogiannaki and E. Anagnostaras
Germaine Yadang , Jean Bosco Tchatchueng and Clerge Tchiegang
Yoshitoshi Nakamura , Akihiro Kurosumi and Godliving Mtui
P.D. Mbougueng , D. Tenin , J. Scher and C. Tchiegang
M.G. Nunez-Gutierrez , J.M. Tapia-Gonzalez , M. Becerril-Herrera , R. Ramirez-Necoechea , M. Alonso-Spilsbury and D. Mota-Rojas