On the geometry of wave fronts
Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta, Tome 37 (2006) no. 3, pp. 79-80.

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P. D. Lebedev; A. A. Uspenskii. On the geometry of wave fronts. Izvestiya Instituta Matematiki i Informatiki Udmurtskogo Gosudarstvennogo Universiteta, Tome 37 (2006) no. 3, pp. 79-80. http://geodesic.mathdoc.fr/item/IIMI_2006_37_3_a35/

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