@INBOOK {WIEN:1979,
title = {Drought stress of cowpea and soybean under tropical conditions},
author = {Wien, H. C. and Litttleton, E. J. and Ayanaba, A. },
year = {1979},
type = {Stress physiology in rop plants, edited by H. Mussell and R. Staples, J. Wiley and Sons, New York},
}