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Nair, Vijayakumaran P (1989) Development of Nonsocial Behaviour in the Asiatic Elephant. In: Journal of Navigation, 42 (2). pp. 278-290.
Mahapatra, PR and Poulose, MM (1989) Evaluating ILS and MLS Sites without Flight Tests. In: Journal of Navigation, 42 (2). pp. 278-290.