TY - JOUR AU - V. S. Rykhlov TI - On properties of the eigenfunctions of a~quadratic pencil of the second order differential operators JO - Izvestiya of Saratov University. Mathematics. Mechanics. Informatics PY - 2009 SP - 31 EP - 44 VL - 9 IS - 1 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ISU_2009_9_1_a4/ LA - ru ID - ISU_2009_9_1_a4 ER -