@ARTICLE {SHANNON: 1994a,
title = {The effects of alley cropping and fertilizer application on continuously cropped maize},
author = {Shannon, D. A. and Vogel, W. O. and Kabaluapa, K. N. },
journal = {Tropical Agriculture},
year = {1994},
volume = {71},
number = {3},
pages = {163--169},
}