On a Lagrange problem and its generalizations
Séminaire Goulaouic-Schwartz (1993-1994), Exposé no. 13, 12 p. 
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Kondratiev, V. A.; Egorov, Yu. V. On a Lagrange problem and its generalizations. Séminaire Goulaouic-Schwartz (1993-1994), Exposé no. 13, 12 p.. https://www.numdam.org/item/SEDP_1993-1994____A14_0/

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