no. 4
Some non-homogeneous symbols and associated pseudo-differential operators
Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 21 (1967) no. 4, pp. 547-574. 
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     title = {Some non-homogeneous symbols and associated pseudo-differential operators},
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Zaidman, S. Some non-homogeneous symbols and associated pseudo-differential operators. Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche, Série 3, Tome 21 (1967) no. 4, pp. 547-574. http://archive.numdam.org/item/ASNSP_1967_3_21_4_547_0/

1 J.J. Kohn and L. Nirenberg: An Algebra of Pseudo-Differential Operators, Comm. Pure Appl. Math., February-May 1965. | MR | Zbl

2 L. Hörmander: Psendo-Differential Operators and Non-Elliptic Boundary Problems Ann. of Math., January 1966. | MR | Zbl

3 L. Hörmander: Hypoelliptic pseudo-differential operators, Conference Chicago.

4 S. Zaidman: On Kohn-Nirenberg's pseudo-differential operators, in preparation.

5 S. Zaidman: Operatori pseudo-differenziali, Rend. Sem. Mat. Fis. Milano, to appear. | MR | Zbl

6 S. Zaidman: Théorie des distributions, Univ. Lovel, 1965.