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Boniao R., . and Shamshuddin Jusop, . and Siti Zauyah Darus, . and Syed Omar Syed Rastan, . and Van Ranst E., . (1998) The effects of cultivation on the chemical properties of volcanic soils of Camiguin Island Southern Philippines. [Proceedings Paper]
Van Ranst E., . and Boniao R., . and Shamshuddin Jusop, . and Baert G., . (1997) Impact of agriculture on chemical properties of soils on basalt from Mindanao the Philippines. [Proceedings Paper]