@INPROCEEDINGS {ORTIZ:2003, title = {Improving crops to nourish African Agricultural Technology Foundation}, author = {Ortiz, R. }, booktitle = {Oral presentation at the CGIAR Biofortification Challenge Program Vitamin A Maize Workshop, 4 August}, year = {2003}, organization = {International Institute of Tropical Agriculture (IITA)}, location = {Ibadan, Nigeria}, }