Geodesic
``Quasi-isotropic'' approximation of geometrical optics
Doklady Akademii Nauk, Tome 183 (1968) no. 1, pp. 74-76.

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     author = {Yu. A. Kravtsov},
     title = {``Quasi-isotropic'' approximation of geometrical optics},
     journal = {Doklady Akademii Nauk},
     pages = {74--76},
     publisher = {mathdoc},
     volume = {183},
     number = {1},
     year = {1968},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_183_1_a18/}
}
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Yu. A. Kravtsov. ``Quasi-isotropic'' approximation of geometrical optics. Doklady Akademii Nauk, Tome 183 (1968) no. 1, pp. 74-76. http://geodesic.mathdoc.fr/item/DAN_1968_183_1_a18/