@ARTICLE {SANGINGA:1991b,
title = {Variation in nodulation and N2 fixation by the Gliricidia sepium/Rhizobium spp. symbiosis in a calcareous soil},
author = {Sanginga, N. and Manrique, K. and Hardarson, G. },
journal = {Biology and Fertility of Soils},
year = {1991},
volume = {11},
number = {4},
pages = {273--278},
}