@ARTICLE {OKOGUN:2004,
title = {Soybean yield determinants and response to rhizobial inoculation in an on-farm trial in the northern Guinea savanna of Nigeria},
author = {Okogun, J. and Otuyemi, B. and Sanginga, P. },
journal = {West African Journal of Applied Ecology},
year = {2004},
volume = {6},
pages = {30--39},
}