@ARTICLE {VANLAUWE:1998b, title = {Recovery of leucaena and dactyladenia residue nitrogen-15 in alley cropping systems}, author = {Vanlauwe, B. and Sanginga, N. and Merckx, R. }, journal = {Soil Science Society of America Journal}, year = {1998}, volume = {62}, number = {2}, pages = {454--460}, issn = {0361-5995}, }