@BOOK {FRESCO:1993, title = {The dynamic of cassava in Africa; an outline of research issues: COSCA working paper, No. 9}, author = {Fresco, L. }, series = {COSCA working paper}, year = {1993}, number = {9}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {RTB; Root and Tuber; Cassava}, }