The symbol of a lagrangian distribution
Journées équations aux dérivées partielles (1995), article no. 5, 12 p. 
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Vassiliev, Dimitri G. The symbol of a lagrangian distribution. Journées équations aux dérivées partielles (1995), article  no. 5, 12 p. http://www.numdam.org/item/JEDP_1995____A5_0/

1. A. Laptev, Yu. Safarov and D. Vassiliev, On global representation of Lagrangian distributions and solutions of hyperbolic equations, Communications on Pure and Applied Mathematics, 1994, vol. 47, no. 11, p. 1411-1456. | MR | Zbl

2. L. Hörmander, The analysis of linear partial differential operators, vol. 1, Springer-Verlag, Berlin, 1983. | Zbl

3. D. Vassiliev, Construction of the wave group for higher order partial differential operators, Équations aux Dérivées Partielles, Séminaire 1994-1995, Exposé no. IX 22 Novembre 1994, École Polytechnique, p. IX-1 - IX-14. | Numdam | Zbl

4. Yu. Safarov and D. Vassiliev, The Asymptotic Distribution of Eigenvalues of Partial Differential Operators, American Mathematical Society, monograph in preparation.