@article{DAN_1983_271_4_a6,
     author = {V. A. Rukavishnikov},
     title = {A coercive estimate of the rate of convergence of an approximate},
     journal = {Doklady Akademii Nauk},
     pages = {798--801},
     publisher = {mathdoc},
     volume = {271},
     number = {4},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1983_271_4_a6/}
}