@BOOK {COMBS:1995, title = {Improvement of soil fertility and weed suppression through legume-based technologies: IITA research guide, No. 48}, author = {Collaborative Group on Maize-Based Systems Research (COMBS), }, series = {IITA research guide, No. 48}, year = {1995}, month = {April}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {52p.; IITA Technologies}, }