Geodesic
Subelliptic operators
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 2, pp. 59-118

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We consider a class of pseudodifferential operators that occupies an intermediate position between the classes of elliptic and hyperbolic operators. We give an adequate description of subelliptic scalar operators in terms of the highest part of the symbol. Our results can be used in the study of boundary value problems for elliptic differential equations. 
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     author = {Yu. V. Egorov},
     title = {Subelliptic operators},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {59--118},
     publisher = {mathdoc},
     volume = {30},
     number = {2},
     year = {1975},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_1975_30_2_a1/}
}
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Yu. V. Egorov. Subelliptic operators. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 30 (1975) no. 2, pp. 59-118. http://geodesic.mathdoc.fr/item/RM_1975_30_2_a1/