@INPROCEEDINGS {NANGJU:1980a, title = {Effect of plant density, spatial arrangement and plant type on weed control in cowpea and soybean: proceedings of a conference held at the IITA, Ibadan, Nigeria, July 3-7, 1978}, author = {Nangju, D. }, booktitle = {Weeds and their control in the humid and subhumid tropics: proceedings of a conference held at the IITA, Ibadan, Nigeria, July 3-7, 1978, edited by I. Okezie}, year = {1980}, pages = {288--299}, }