@PROCEEDINGS {RAO:1980a,
title = {Exploiting symbiotic nitrogen fixation for increasing soybean yields in Africa},
author = {Rao, R. V. and Ayanaba, A. and Eaglesham, A. R. J. and Kueneman, E. },
booktitle = {GIAM VI Conference, Lagos, Nigeria, September 1980},
year = {1980},
}