TY  - JOUR
AU  - O. A. Timoshin
TI  - Best approximation of the operator of second mixed derivative in the metrics of $L$ and $C$ on the plane
JO  - Matematičeskie zametki
PY  - 1984
SP  - 369
EP  - 375
VL  - 36
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1984_36_3_a9/
LA  - ru
ID  - MZM_1984_36_3_a9
ER  -