@article{DAN_1968_178_3_a7,
     author = {A. L. Krylov},
     title = {Difference approximation to differential operators of mathematical physics},
     journal = {Doklady Akademii Nauk},
     pages = {535--538},
     year = {1968},
     volume = {178},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_178_3_a7/}
}