@article{10_21136_CMJ_1965_100666,
     author = {Ma\v{r}{\'\i}k, Jan},
     title = {Extensions of additive mappings},
     journal = {Czechoslovak Mathematical Journal},
     pages = {244--252},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {1965},
     doi = {10.21136/CMJ.1965.100666},
     mrnumber = {0177091},
     zbl = {0192.14504},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1965.100666/}
}