@INBOOK {AYANABA:1981a, title = {Rhizobium and its utilization in African soils}, author = {Ayanaba, A. }, editor = {Emejuaiwe, S. O. and Ogunbi, O. and Sanni, S. O. }, series = {Global impacts of Applied Microbiology}, year = {1981}, type = {GIAM VI}, pages = {85--95}, publisher = {Academic Press}, address = {London}, }