Titlebook: Caustics, Catastrophes and Wave Fields; Yu. A. Kravtsov,Yu. I. Orlov Book 19931st edition Springer-Verlag Berlin Heidelberg 1993 acoustics

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Observability for Parabolic Equations,less Maxwell’s equations. Nevertheless manageable asymptotic solutions can be obtained for caustics in dispersive and anisotropic media, in nonlinear and random media and for related problems of quantum mechanics.

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Springer Series on Wave Phenomenahttp://image.papertrans.cn/c/image/222664.jpg

conservative

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