@INBOOK {ORTIZ:2002k, title = {Germplasm enhancement to sustain genetic gains in crop improvement}, author = {Ortiz, R. }, editor = {Engels, J and Rao, V and Brown, A. and Jackson, }, year = {2002}, type = {Managing plant genetic diversity}, pages = {275--290}, publisher = {Wallingford, UK: International Plant Genetic Resources Institute (IPGRI); CABI}, }