@article{DAN_1968_178_3_a11,
     author = {P. E. Sobolevskii},
     title = {The {Bubnov{\textendash}Galerkin} method for parabolic equations in {Hilbert} space},
     journal = {Doklady Akademii Nauk},
     pages = {548--551},
     year = {1968},
     volume = {178},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1968_178_3_a11/}
}