Geodesic
On conditions of discreteness of the spectrum of monomial differential operators
Differencialʹnye uravneniâ, Tome 2 (1966) no. 5, pp. 634-639 
V. A. Tkachenko. On conditions of discreteness of the spectrum of monomial differential operators. Differencialʹnye uravneniâ, Tome 2 (1966) no. 5, pp. 634-639. http://geodesic.mathdoc.fr/item/DE_1966_2_5_a6/
@article{DE_1966_2_5_a6,
     author = {V. A. Tkachenko},
     title = {On conditions of discreteness of the spectrum of monomial differential operators},
     journal = {Differencialʹnye uravneni\^a},
     pages = {634--639},
     year = {1966},
     volume = {2},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1966_2_5_a6/}
}
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