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PL, Sachdev and BM, Vaganan (1992) Exact-Solutions Of Linear Partial-Differential Equations With Variable-Coefficients. In: Studies in Applied Mathematics, 87 (3). pp. 213-237.
PL, Sachdev and Neelam, Gupta and DS, Ahluwalia (1992) Global solutions describing the collapse of a spherical or cylindrical cavity. In: Zeitschrift für Angewandte Mathematik und Physik (ZAMP), 43 (5). pp. 856-874.
