@article{10_21136_CMJ_1981_101742,
     author = {Jarn{\'\i}k, Ji\v{r}{\'\i}},
     title = {Multivalued mappings and {Filippov's} operation},
     journal = {Czechoslovak Mathematical Journal},
     pages = {275--288},
     publisher = {mathdoc},
     volume = {31},
     number = {2},
     year = {1981},
     doi = {10.21136/CMJ.1981.101742},
     mrnumber = {611080},
     zbl = {0473.34018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1981.101742/}
}