@BOOK {HAHN:1992, title = {Management of yam diseases: IITA research guide, No. 39}, author = {Hahn, S. K. }, series = {IITA research guide, No. 39}, year = {1992}, month = {January}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {RTB; Root and Tuber; Yam.; 16p.}, }