@ARTICLE {SANGINGA:1988,
title = {Nitrogen contribution of Leucanea/Rhizobium symbiosis to soil and a subsequent maize crop},
author = {Sanginga, N. and Mulongoy, K. and Ayanaba, A. },
journal = {Plant and Soil},
year = {1988},
volume = {112},
pages = {137--141},
}