@article{DAN_1957_113_2_a1,
     author = {N. S. Bakhvalov},
     title = {On the number of arithmetical operations in solving {Poisson{\textquoteright}s} equation for a square by means of finite differences},
     journal = {Doklady Akademii Nauk},
     pages = {252--254},
     publisher = {mathdoc},
     volume = {113},
     number = {2},
     year = {1957},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1957_113_2_a1/}
}