@INBOOK {NG:1996, title = {The role of Plant Quarantine Service in germplasm conservation}, author = {Ng, N. Q. }, editor = {Esuruoso, O. F. and Schilder, A. M. C. }, year = {1996}, type = {Plant quarantine and seed pathology: keys to sustainable agriculture}, pages = {29--35}, publisher = {International Institute of Tropical Agriculture (IITA); Plant Quarantine Service of Nigeria}, address = {Ibadan, Nigeria}, }