Geodesic
On branch points of optical hypersurfaces
Doklady Akademii Nauk, Tome 221 (1975) no. 5, pp. 1027-1030.

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     author = {M. M. Lavrent'ev and V. R. Kireitov},
     title = {On branch points of optical hypersurfaces},
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     pages = {1027--1030},
     publisher = {mathdoc},
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     number = {5},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1975_221_5_a5/}
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M. M. Lavrent'ev; V. R. Kireitov. On branch points of optical hypersurfaces. Doklady Akademii Nauk, Tome 221 (1975) no. 5, pp. 1027-1030. http://geodesic.mathdoc.fr/item/DAN_1975_221_5_a5/