@INBOOK {FATOKUN:1997a, title = {Wide crossing in African Vigna species}, author = {Fatokun, C. and Perrino, P. and Ng, N. Q. }, year = {1997}, type = {Advances in Cowpea research}, pages = {50--57}, chapter = {4}, publisher = {International Institute of Tropical Agriculture (IITA); Japan International Research Center for Agricultural Sciences (JIRCAS)}, address = {Ibadan, Nigeria}, }