@article{MZM_1969_6_6_a3,
     author = {E. A. Volkov},
     title = {On the conditions that the net method for the {Laplace} equation converges with speed~$h^2$},
     journal = {Matemati\v{c}eskie zametki},
     pages = {669--679},
     publisher = {mathdoc},
     volume = {6},
     number = {6},
     year = {1969},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1969_6_6_a3/}
}