Lumbanraja, Jamalam and Evangelou, V.P. (1994) Adsorption-Desorption of Potassium and Ammonium at Low Cation Concentrations in Three Kentucky Subsoils. Soil Science, 157 (5). pp. 269-278. ISSN 0038-075X

Nugroho, Ghani Sutopo and Lumbanraja, Jamalam and Suprapto, Hermanus and Sunyoto, . and Ardjasa, Wayan Sabe and Haraguchi, Hiroki and Kimura, Makoto (1994) Effect of intermittent irrigation on methane emission from an Indonesian paddy field. Soil Science and Plant Nutrition, 40 (4). pp. 609-615. ISSN 0038-0768

Nugroho, Ghani Sutopo and Lumbanraja, Jamalam and Suprapto, Hermanus and Sunyoto, . and Ardjasa, Wayan Sabe and Haraguchi, Hiroki and Kimura, Makoto (1994) Methane Emission from an Indonesian Paddy Field Subjected to Several Fertilizer Treatments. Soil Science and Plant Nutrition, 40 (2). pp. 275-281. ISSN 0038-0768