@INBOOK {NG:1992d, title = {Tissue culture of root and tuber crops at IITA}, author = {Ng, S. Y. C. }, year = {1992}, type = {Biotechnology:enhancing reseach on tropical cops in africa, edited by G. Thottapily, L.M.Monti, D.R. Mohan Raji, and A.W. Moore}, pages = {135--141}, publisher = {CTA; International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, }