@article{ZVMMF_1980_20_3_a28,
     author = {N. N. Voitovich},
     title = {Naturalness of boundary conditions in a variational method for solving boundary value problems},
     journal = {\v{Z}urnal vy\v{c}islitelʹnoj matematiki i matemati\v{c}eskoj fiziki},
     pages = {781--786},
     year = {1980},
     volume = {20},
     number = {3},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZVMMF_1980_20_3_a28/}
}