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Lumbanraja, Jamalam and Syam, Tamaluddin and Nishide, Hiroyo and Mahi, Ali Kabul and Utomo, Muhajir and Sarno, - and Kimura, Makoto (1998) Deterioration of soil fertility by land use changes in South Sumatra, Indonesia: from 1970 to 1990. Hydrological Processes, 12. pp. 2003-2013.

Syam, Tamaluddin and Nishide, Hiroyo and Salam, Abdul Kadir and Utomo, Muhajir and Mahi, Ali Kabul and Lumbanraja, Jamalam and Nugroho, Ghani Sutopo and Kimura, Makoto (1997) Land use and cover changes in a Hilly Area of South Sumatra, Indonesia (from 1970 to 1990). Soil Science and Plant Nutrition, 43 (3). pp. 587-599. ISSN 0038-0768