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N. D. DURADO, and D. POWLSON, and R. ABU BAKAR, and O.O.S. BACCHI, and C. PHAN THI, and G. KEERTHISINGHE, and M. ISMAILI, and S. M. RAHMAN, and K. REICHARDT, and M.S.A. SAFWAT, and R. SANGAKKARA, and D.T. TERUEL, and L.C. TIMM, and JIA YU WANG, and E. ZAGAL, and C. V. KESSEL, (2010) Multi-season recoveries of nitrogen- 15 in crops and soil from organic and inorganic sources in tropical cropping systems. Soil Science Society of America Journal,Vol. 74. N°1. January-February, pp.139-152, 2010.