TY - JOUR AU - Yu. V. Pokornyi AU - Zh. I. Bakhtina AU - A. S. Ishchenko TI - On solvability of certain classes of irregular the second order variation problems JO - Izvestiya of Saratov University. Mathematics. Mechanics. Informatics PY - 2007 SP - 32 EP - 36 VL - 7 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/ISU_2007_7_2_a6/ LA - ru ID - ISU_2007_7_2_a6 ER -