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Salam, Abdul Kadir and Helmke, Philip A. (1995) Measurement of Free Ionic Activities of Heavy Metals in Soil Solution Using Donnan Analysis. Jurnal Ilmiah Ilmu-Ilmu Pertanian, 3 (1). pp. 13-19. ISSN 0854-7394
Utomo, Muhajir (1995) Effect of rock phosphate on soil properties and apparent phosphorus recovery in acid soil of Sumatra. Plant and Soil, 171 (1). pp. 199-202. ISSN 1573-5036