Geodesic
The Bessel inequality and the basis property of root functions of a second-order singular differential operator
Differencialʹnye uravneniâ, Tome 36 (2000) no. 8, pp. 1011-1020 
O. V. Belyantsev. The Bessel inequality and the basis property of root functions of a second-order singular differential operator. Differencialʹnye uravneniâ, Tome 36 (2000) no. 8, pp. 1011-1020. http://geodesic.mathdoc.fr/item/DE_2000_36_8_a0/
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     author = {O. V. Belyantsev},
     title = {The {Bessel} inequality and the basis property of root functions of a second-order singular differential operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1011--1020},
     year = {2000},
     volume = {36},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2000_36_8_a0/}
}
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