Geodesic
The index of boundary value problems for degenerating elliptic operators
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 26 (1971) no. 6 
A. V. Marchenko. The index of boundary value problems for degenerating elliptic operators. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 26 (1971) no. 6. http://geodesic.mathdoc.fr/item/RM_1971_26_6_a10/
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     author = {A. V. Marchenko},
     title = {The index of boundary value problems for degenerating elliptic operators},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     year = {1971},
     volume = {26},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/RM_1971_26_6_a10/}
}
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[1] M. I. Vishik, V. V. Grushin, “Ob odnom klasse vyrozhdayuschikhsya ellipticheskikh uravnenii vysshikh poryadkov”, Matem. sb., 79 (121):1 (5) (1969), 3–36 | Zbl

[2] M. S. Agranovich, “Ellipticheskie singulyarnye integro-differentsialnye operatory”, UMN, 20:5 (125) (1965), 3–120 | MR | Zbl