@ARTICLE {IBEWIRO:2000, title = {Transformations and recovery of residue and fertilizer nitrogen-15 in a sandy Lixisol of West Africa}, author = {Ibewiro, B. and Vanlauwe, B. and Sanginga, P. and Merckx, R. }, journal = {Biology and Fertility of Soils}, year = {2000}, volume = {31}, pages = {261--269}, }