@INPROCEEDINGS {WILLIAMS:1975f, title = {The international testing program: aims, progress and problems seen from IITA}, author = {Williams, R. J. }, booktitle = {Proceedings of IITA Collaborators' Meeting on Grain Legume Improvement held at IITA on 9-13 June, 1975 edited by R. A. Luse and K. O. Rachie}, year = {1975}, pages = {66--72}, }