@INBOOK {ORKWOR:1998, title = {Growth and development}, author = {Orkwor, G. C. and Ekanayake, I. J. }, editor = {Orkwor, G. C. and Asiedu, R. and Ekanayake, I. J. }, year = {1998}, type = {Food yams: advances in research}, pages = {39--62}, publisher = {International Institute of Tropical Agriculture (IITA): NRCRI}, address = {Ibadan: Umudike, Nigeria}, }