@INBOOK {NG:1999a, title = {Yam field genebank management at IITA}, author = {Ng, S. Y. C. and Ng, N. Q. }, editor = {Engelmann, F. }, year = {1999}, type = {Management of field and in vitro germplasm collections}, pages = {124--126}, publisher = {IPGRI}, address = {Rome, Italy}, note = {RTB; Root and Tuber; Yam}, }