Criteria for the discreteness of the spectrum of a hypoelliptic operator
Matematičeskie zametki, Tome 30 (1981) no. 5, pp. 685-693.

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     author = {M. G. Gimadislamov},
     title = {Criteria for the discreteness of the spectrum of a hypoelliptic operator},
     journal = {Matemati\v{c}eskie zametki},
     pages = {685--693},
     publisher = {mathdoc},
     volume = {30},
     number = {5},
     year = {1981},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1981_30_5_a5/}
}
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M. G. Gimadislamov. Criteria for the discreteness of the spectrum of a hypoelliptic operator. Matematičeskie zametki, Tome 30 (1981) no. 5, pp. 685-693. http://geodesic.mathdoc.fr/item/MZM_1981_30_5_a5/