Geodesic
On a~class of pseudodifferential operators with an infinite number of variables, and applications
Sbornik. Mathematics, Tome 15 (1971) no. 3, pp. 443-491

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In this work there are investigated pseudodifferential operators of an infinite number of variables whose symbols, roughly speaking, are comparable with a fractional power of a fixed elliptic quadratic form. A composition formula for such operators is proved. Applications are made to the theory of elliptic and parabolic operators of higher orders. Figures: 2. Bibliography: 8 titles. 
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     title = {On a~class of pseudodifferential operators with an infinite number of variables, and applications},
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P. M. Bleher; M. I. Vishik. On a~class of pseudodifferential operators with an infinite number of variables, and applications. Sbornik. Mathematics, Tome 15 (1971) no. 3, pp. 443-491. http://geodesic.mathdoc.fr/item/SM_1971_15_3_a4/