@article{ASNSP_1967_3_21_3_427_0,
     author = {Ne\v{c}as, Jind\v{r}ich},
     title = {Sur la r\'egularit\'e des solutions variationnelles des \'equations elliptiques non-lin\'eaires d{\textquoteright}ordre $2k$ en deux dimensions},
     journal = {Annali della Scuola Normale Superiore di Pisa - Scienze Fisiche e Matematiche},
     pages = {427--457},
     publisher = {Scuola normale superiore},
     volume = {3e s{\'e}rie, 21},
     number = {3},
     year = {1967},
     mrnumber = {226467},
     zbl = {0171.09401},
     language = {fr},
     url = {http://archive.numdam.org/item/ASNSP_1967_3_21_3_427_0/}
}