Geodesic
A theorem on the structure of wave fronts and its applications in symplectic topology
Funkcionalʹnyj analiz i ego priloženiâ, Tome 21 (1987) no. 3, pp. 65-72 
Ya. M. Eliashberg. A theorem on the structure of wave fronts and its applications in symplectic topology. Funkcionalʹnyj analiz i ego priloženiâ, Tome 21 (1987) no. 3, pp. 65-72. http://geodesic.mathdoc.fr/item/FAA_1987_21_3_a6/
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