TY  - JOUR
AU  - U. D. Bekbaev
TI  - Equivalence and invariants of second-order linear partial differential equations in two variables under a~change of variables
JO  - Izvestiâ vysših učebnyh zavedenij. Matematika
PY  - 1999
SP  - 3
EP  - 10
IS  - 11
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/IVM_1999_11_a0/
LA  - ru
ID  - IVM_1999_11_a0
ER  -