@BOOK {NWEKE:1988f, title = {Collaborative Study of Cassava in Africa (COSCA); project description: COSCA working paper, No. 1}, author = {Nweke, F. }, series = {COSCA working paper}, year = {1988}, number = {1}, publisher = {International Institute of Tropical Agriculture (IITA)}, address = {Ibadan, Nigeria}, note = {68p.}, }