@article{10_21136_AM_1993_104568,
     author = {K\v{r}{\'\i}\v{z}ek, Michal},
     title = {On approximation of the {Neumann} problem by the penalty method},
     journal = {Applications of Mathematics},
     pages = {459--469},
     publisher = {mathdoc},
     volume = {38},
     number = {6},
     year = {1993},
     doi = {10.21136/AM.1993.104568},
     mrnumber = {1241449},
     zbl = {0795.65075},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/AM.1993.104568/}
}