@INBOOK {TERAO:1997, title = {Agro-physiological constarints in intercropped cowpea: an analysis}, author = {Terao, T. and Watanabe, I. and Matsunaga, R. and Hakoyama, S. and Singh, B. }, year = {1997}, type = {Advances in cowpea research}, pages = {129--140}, chapter = {11}, publisher = {International Institute of Tropical Agriculture (IITA); Japan International Research Center for Agricultural Sciences}, }