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, no. 2 (2007), pp. 158-161

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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. 
@article{VSGTU_2007_2_a22,
     author = {A. S. Tsareva},
     title = {Sufficient condition of {Hilbertness} of some eigenfunctions systems of the second order differential operator},
     journal = {Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences},
     pages = {158--161},
     publisher = {mathdoc},
     number = {2},
     year = {2007},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/VSGTU_2007_2_a22/}
}
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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, no. 2 (2007), pp. 158-161. http://geodesic.mathdoc.fr/item/VSGTU_2007_2_a22/