@ARTICLE {DANSO:1992,
title = {Biological nitrogen fixation in trees in agro-ecosystems},
author = {Danso, S. K. A. * and Bowen, G. D. and Sanginga, N. },
journal = {Plant and Soil},
year = {1992},
volume = {141},
number = {1-2},
pages = {177--196},
}