Hasan A. Bjaili, Ali M. Rushdi
DOI:
10.9734/jerr/2020/v18i417215
Page: 30-50
M. M. Reddy, N. S. Reddy, J. N. Evan
DOI:
10.9734/jerr/2020/v18i417212
Page: 1-11
Sunday N. Ozonuwe, Dennar Onyekachi, Collins U. Oside
DOI:
10.9734/jerr/2020/v18i417213
Page: 12-20
H. Uguru, G. E. Obah
DOI:
10.9734/jerr/2020/v18i417218
Page: 51-58
Yerima B. D. Aboubacar, G. Guero Yadji
DOI:
10.9734/jerr/2020/v18i417214
Page: 21-29