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Gupta, PN (1980) Concept of wads molecular compressibility and Raos molecular velocity. In: Acustica, 44 (3). pp. 237-239.
Gupta, PN (1979) Few materials for acoustic lenses for use in acoustic imaging. In: Acustica, 42 (4). pp. 273-277.
Mehta, SD and Gupta, PN (1978) Restoration of Aspect Ratio by Holographic Lenses In a Bragg-Diffraction Imaging-System. In: IEEE Transactions on Sonics and Ultrasonics, 25 (4). 262-262 .
