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Naidu , PS and Mohan, Krishna PG (1991) Signal subspace approach in localization of sound source in shallow water. In: Signal Processing, 24 (1). pp. 31-42.
Naidu, PS and Mohan, Krishna PG (1989) A study of the spectrum of an acoustic field in shallow water due to noise sources at the surface. In: Journal of the Acoustical Society of America, 85 (2). pp. 716-725.