@article{TRSPY_1983_154_a25,
     author = {V. V. Filippov},
     title = {Normally situated subspaces},
     journal = {Informatics and Automation},
     pages = {239--251},
     publisher = {mathdoc},
     volume = {154},
     year = {1983},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1983_154_a25/}
}