@article{DAN_1973_209_2_a9,
     author = {S. G. Mikhlin},
     title = {Some approximation problems in the variational-difference method},
     journal = {Doklady Akademii Nauk},
     pages = {299--301},
     publisher = {mathdoc},
     volume = {209},
     number = {2},
     year = {1973},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1973_209_2_a9/}
}