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