M. B. Castillo, C. P. Mamaril, E. S. Paterno, P. C. Sta. Cruz, P. B. Sanchez, and R. B. Badayos, “Managing Rice Residues and Fertilization to Improve Nutrient Use and Productivity of Irrigated Lowland Rice”, Ann. Trop. Res, vol. 34, no. 2, pp. 1–25, Nov. 2012.