@ARTICLE {AYENI:1984b, title = {Weed interference in maize, cowpea, maize/cowpea intercrop in a subhumid tropical environment. III. Influence of land preparation}, author = {Ayeni, A. O. and Duke, W. B. and Akobundu, I. }, journal = {Weed Research}, year = {1984}, volume = {24}, pages = {439--448}, }