Geodesic
A theorem on the unconditional basis property of root vectors of second-order weighted differential operators
Differencialʹnye uravneniâ, Tome 27 (1991) no. 9, pp. 1550-1563 
I. S. Lomov. A theorem on the unconditional basis property of root vectors of second-order weighted differential operators. Differencialʹnye uravneniâ, Tome 27 (1991) no. 9, pp. 1550-1563. http://geodesic.mathdoc.fr/item/DE_1991_27_9_a9/
@article{DE_1991_27_9_a9,
     author = {I. S. Lomov},
     title = {A theorem on the unconditional basis property of root vectors of second-order weighted differential operators},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1550--1563},
     year = {1991},
     volume = {27},
     number = {9},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1991_27_9_a9/}
}
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