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Evangelou, V.P. and Lumbanraja, Jamalam (2002) Ammonium–Potassium–Calcium Exchange on Vermiculite and Hydroxy-aluminum Vermiculite. Soil Science Society American Journal, 66. pp. 445-455. ISSN 0361-5995

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

Lumbanraja, Jamalam and Evangelou, V.P. (1992) Potassium Quantity-Intensity Relationships in the Presence and Absence of NH4+ for Three Kentucky Soils. Soil Science, 154 (5). pp. 366-376. ISSN 0038-075X

Lumbanraja, Jamalam and Evangelou, V.P. (1990) Binary and Ternary Exchange Behavior of Potassium and Ammonium on Kentucky Subsoils. Soil Science Society American Journal, 54. pp. 698-705. ISSN 0361-5995