@INPROCEEDINGS {ABIFARIN:1975a, title = {Limitations in rice improvement activites and how to improve them by team approach in Africa: paper presented at the Rice Workshop, Rokupr, Sierra Leone, September 28 - October 4, 1975}, author = {Abifarin, A. O. and Virmani, S. S. *}, booktitle = {IITA Cereal Improvement Program papers: 1972-76}, year = {1975}, month = {September}, pages = {86--93}, }