@INPROCEEDINGS {WIEN:1975c, title = {Yield physiology of cowpea (Vigna unguiculata, L. Walp): a review of work at IITA}, author = {Wien, H. C. }, booktitle = {Proceedings of Physiology Program Formulation Workshop held at IITA, Ibadan, April, 1975.}, year = {1975}, month = {April}, pages = {74--76}, }