Novpriansyah, Hery and Pramono, D. Cahyo and Salam, Abdul Kadir (2001) Macro and Micronutrient Availabilities in Ultisol from Sungkai Utara after Treatment with Metal-Spoon Industrial Waste, lime, and Peat Containing Fertilizer. Journal of Tropical Soils, 7 (2). pp. 51-58. ISSN 0852-257X

Salam, Abdul Kadir and Afandi, . and Sriyani, Nanik and Kimura, Makoto (2001) Soil Enzymatic Activities in a Hilly Coffee Plantation in Lampung Province, South Sumatra, Indonesia, under Plant Cover Management. Soil Science and Plant Nutrition, 45 (4). pp. 695-702. ISSN 0038-0768

Watanabe, Akira and Sarno, - and Lumbanraja, Jamalam and Tsutsuki, Kiyoshi and Kimura, Makoto (2001) Humus composition of soils under forest, coffee and arable cultivation in hilly areas of south Sumatra, Indonesia. European Journal of Soil Science, 52. pp. 599-606. ISSN 1365-2389

Yusnaini, Sri and Niswati, Ainin and Arif, Mas Achmad Syamsul and Matsumoto, Sadayoshi and Nonaka, masanori (2001) earthworm Population in Deforested land in Hilly Area Sumberjaya West Lampung. Journal of Tropical Soils, 14. pp. 141-146. ISSN 0852-257X