TY - JOUR AU - E. Yu. Derevtsov TI - A difference approximation of the covariant derivative and other operators and geometric objects given in a Riemannian domain JO - Sibirskie èlektronnye matematičeskie izvestiâ PY - 2015 SP - 973 EP - 990 VL - 12 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SEMR_2015_12_a65/ LA - ru ID - SEMR_2015_12_a65 ER -