Asio, V. B., Demain, K. L. B., Olguera, D. T., & Villasica, L. J. D. (2015). Characteristics and Nutrient Status of Two Degraded Upland Soils in Samar, Philippines. Annals of Tropical Research, 37(1), 142–166. https://doi.org/10.32945/atr37110.2015