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Sachdev, PL and Dowerah, S and Mayil, Vaganan B and Philip, V (1997) Exact analysis of a nonlinear partial differential equation of gas dynamics. In: Quarterly of Applied Mathematics, 55 (2). pp. 201-229.
Sachdev, PL and Philip, V (1988) Exact simple waves on shear flows in a compressible barotropic medium. In: Studies in Applied Mathematics, 79 (3). pp. 193-203.
Sachdev, PL and Philip, V (1986) Invariance group properties and exact solutions of equations describing time-dependent free surface flows under gravity. In: Quarterly of Applied Mathematics, 43 (4). 465 -482.