@article{IVM_1963_4_a8,
     author = {M. E. Kva\v{c}ko},
     title = {On the extension of a~set function},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {61--66},
     publisher = {mathdoc},
     number = {4},
     year = {1963},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1963_4_a8/}
}