Geodesic
Conditions for the $k$-fold completeness ($0$) of root functions of an $n$th-order ordinary differential operator pencil
Differencialʹnye uravneniâ, Tome 42 (2006) no. 6, pp. 723-730 
A. I. Vagabov; Z. A. Abdurakhmanov. Conditions for the $k$-fold completeness ($0
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     title = {Conditions for the $k$-fold completeness ($0<k\le n$) of root functions of an $n$th-order ordinary differential operator pencil},
     journal = {Differencialʹnye uravneni\^a},
     pages = {723--730},
     year = {2006},
     volume = {42},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_6_a0/}
}
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