@PROCEEDINGS {WINCH:1977, title = {Rice in Tropical Africa: The Rlative Importance of Rice in Tropical Africa and the need to increase Farm Level Economics Data Base}, author = {Winch, F. E. and Kivunja, C. D. }, booktitle = {Invited papers for rice in Africa workshop}, year = {1977}, publisher = {IITA, Ibadan}, note = {March 7-11}, }