@article{IVM_1970_8_a15,
     author = {M. I. Khaikin},
     title = {The regularization of operators with a~nonclosed range of values},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {118--123},
     year = {1970},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1970_8_a15/}
}