@ARTICLE {HAHN:1989, title = {Resistance breeding in root and tuber crops at the International Institute of Tropical Agriculture (IITA), Ibadan, Nigeria}, author = {Hahn, S. K. and Isoba, J. C. G. and Ikotun, T. *}, journal = {Crop Protection}, year = {1989}, volume = {8}, number = {3}, pages = {147--168}, issn = {0261-2194}, note = {RTB; Root and Tuber}, }