Geodesic
A necessary condition for the system of eigen- and associated functions of an ordinary differential operator to be a basis in $L_2(0,1)$
Differencialʹnye uravneniâ, Tome 14 (1978) no. 3, pp. 407-417.

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     author = {S. K. Voronina},
     title = {A necessary condition for the system of eigen- and associated functions of an ordinary differential operator to be a basis in $L_2(0,1)$},
     journal = {Differencialʹnye uravneni\^a},
     pages = {407--417},
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     number = {3},
     year = {1978},
     language = {ru},
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S. K. Voronina. A necessary condition for the system of eigen- and associated functions of an ordinary differential operator to be a basis in $L_2(0,1)$. Differencialʹnye uravneniâ, Tome 14 (1978) no. 3, pp. 407-417. http://geodesic.mathdoc.fr/item/DE_1978_14_3_a1/