@article{MASLO_1961__11_4_a5,
     author = {Vala, Josef},
     title = {O kongruenc{\'\i}ch p\v{r}{\'\i}mek vy\v{t}at\'ych v nadrovin\'ach projektivn{\'\i}ho \v{c}ty\v{r}rozm\v{e}rn\'eho prostoru  $P_4$ te\v{c}n\'ymi rovinami jeho plochy $\Phi$},
     journal = {Mathematica slovaca},
     pages = {263--274},
     publisher = {mathdoc},
     volume = {11},
     number = {4},
     year = {1961},
     zbl = {0111.34701},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/item/MASLO_1961__11_4_a5/}
}