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P. P. Malhotra, V. N. Tandon, and P. P. Shanker, “Distribution of Nutrients and their Return through Litter Fall in an Age Series of <I>Pinus patula</I>, Schl. And Cham. Plantations in Nilgiris”, Indian Forester, vol. 113, no. 5, pp. 323–332, May 1987.