@ARTICLE {EDWARDS:1981,
title = {Differential response of six cowpea (Vigna unguiculata (L) Walp cultivars to liming in an Ultisol},
author = {Edwards, D. G. and Kang, B. and Danso, F. },
journal = {Plant and Soil},
year = {1981},
volume = {59},
pages = {61--73},
}