@INBOOK {COUPER:1980,
title = {Mechanical no-till maize production in an alfisol in tropical Africa},
author = {Couper, D. C. and Lal, R. and Claassen, S. L. },
year = {1980},
type = {IITA publication edited by R. Lal - Crop Production and Soil Tillage},
publisher = {International Institute of Tropical Agriculture (IITA)},
address = {Ibadan, Nigeria},
}