@INPROCEEDINGS {ROSSEL:1991a, title = {Approaches to germplasm health at the International Institute of Tropical Agriculture (IITA), in Nigeria}, author = {Rossel, H. W. and Cardwell, K. }, booktitle = {Proceedings of the Inter-Center Meeting on Germplasm Health and Movement, edited by E.A. Frison}, year = {1991}, pages = {39--48}, publisher = {International Board for Plant Genetic Resources}, address = {Rome, Italy}, }