@MISC {KNIPSCHEER:1980e,
title = {Benchmark surveys of three crops in Nigeria: wheat, millet, sorghum},
author = {Knipscheer, H. C. and Menz, M. and Khadr, F. H. },
year = {1980},
howpublished = {Discussion paper},
note = {IITA/NAFPP, Ibadan},
}