Geodesic
On a theorem of L. Hörmander
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 24 (1969) no. 2 
E. V. Radkevich. On a theorem of L. Hörmander. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 24 (1969) no. 2. http://geodesic.mathdoc.fr/item/RM_1969_24_2_a14/
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     title = {On a~theorem of {L.~H\"ormander}},
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