@article{10_21136_CMJ_1964_100606,
     author = {Ne\v{c}as, Jind\v{r}ich},
     title = {Sur les \'equations diff\'erentielles aux d\'eriv\'ees partielles du type elliptique du deuxi\`eme ordre},
     journal = {Czechoslovak Mathematical Journal},
     pages = {125--146},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {1964},
     doi = {10.21136/CMJ.1964.100606},
     mrnumber = {0174854},
     zbl = {0131.09701},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1964.100606/}
}