Geodesic
Sufficient condition of Hilbertness of some eigenfunctions systems of the second order differential operator
Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences, Tome 115 (2007) no. 2, pp. 158-161 
A. S. Tsareva. Sufficient condition of Hilbertness of some eigenfunctions systems of the second order differential operator. Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences, Tome 115 (2007) no. 2, pp. 158-161. http://geodesic.mathdoc.fr/item/VSGTU_2007_115_2_a22/
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     title = {Sufficient condition of {Hilbertness} of some eigenfunctions systems of the second order differential operator},
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Voir la notice de l'article provenant de la source Math-Net.Ru

We obtain the sufficient condition of Hilbertness for the systems of eigenfunctions of the ordinary linear non-selfjoined differential operator of the second order with the condition that the imaginary parts of spectral parameters are large enough by absolute value.

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