@ARTICLE {SANGINGA: 1994, title = {Field validation of intraspecific variation in phosphorus use efficiency and nitrogen fixation by provenances of Gliricidia sepium grown in low P soils}, author = {Sanginga, N. and Danso, S. K. A. * and Zapata, F. and Bowen, G. D. }, journal = {Applied Soil Ecology}, year = {1994}, volume = {1}, pages = {127--138}, issn = {0929-1393}, }