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- [1] APPLICATION OF THE WKB METHOD TO THE FLOW OF A COMPRESSIBLE FLUID .2. JOURNAL OF MATHEMATICS AND PHYSICS, 1950, 28 (04): : 205 - 214
- [2] APPLICATION OF THE WKB METHOD TO THE FLOW OF A COMPRESSIBLE FLUID .1. JOURNAL OF MATHEMATICS AND PHYSICS, 1949, 28 (03): : 173 - 182