TY  - JOUR
AU  - A. S. Tsareva
TI  - Sufficient condition of Hilbertness of some eigenfunctions systems of the second order differential operator
JO  - Journal of Samara State Technical University, Ser. Physical and Mathematical Sciences
PY  - 2007
SP  - 158
EP  - 161
VL  - 115
IS  - 2
UR  - http://geodesic.mathdoc.fr/item/VSGTU_2007_115_2_a22/
LA  - ru
ID  - VSGTU_2007_115_2_a22
ER  -