[1] Univ Marien Ngouabi, Grp Simulat Numer Magnetisme & Catalyse GSMC, Fac Sci & Tech, BP 69, Brazzaville, Rep Congo
[2] Univ Mohammed 5, Lab Matiere Condensee & Sci Interdisciplinaires L, Fac Sci, BP 1014, Rabat, Morocco
[3] Univ Abomey, ENSGEP, Cotonou, Benin
[4] Univ Abomey Calavi, IMSP, Dangbo, Benin
[5] Univ Abomey Calavi, Dept Phys, Fac Sci Tech FAST, Cotonou, Benin
[6] Hassan II Acad Sci & Technol, Rabat, Morocco