@article{10_21136_AM_1976_103619,
     author = {Vacek, Ji\v{r}{\'\i}},
     title = {Dual variational principles for an elliptic partial differential equation},
     journal = {Applications of Mathematics},
     pages = {5--27},
     publisher = {mathdoc},
     volume = {21},
     number = {1},
     year = {1976},
     doi = {10.21136/AM.1976.103619},
     mrnumber = {0412594},
     zbl = {0345.35035},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/AM.1976.103619/}
}