@INPROCEEDINGS {AYANABA:1973,
title = {Nodulation and nitrogen fixation in six grain legumes},
author = {Ayanaba, A. and Nangju, D. },
booktitle = {Proceedings of the First IITA Grain Legume Improvement Workshop, held at the International Institute of Tropical Agriculture, Ibadan, Nigeria, 29 October-2 November, 1973},
year = {1973},
month = {October},
pages = {198--204},
}