VP Maslov, MV Fedoriuk: Semiclassical Approximation in Quantum Mechanics (Reidel, Dordrecht 1981) 4.51 Yu.A. Kravtsov: "Quasi-isotropic" Geometrical Optics Approximation, Sov. Geometrical Optics in Engineering Physics - Page 344 by I︠U︡riĭ Aleksandrovich Kravt︠s︡ov - 2005 - 355 pages Limited preview -
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