@article{KYB_1969_5_3_a4,
     author = {Vod\'akov\'a, Alena and Vod\'ak, Franti\v{s}ek},
     title = {P\v{r}{\'\i}sp\v{e}vek k probl\'emu validizace},
     journal = {Kybernetika},
     pages = {212--222},
     year = {1969},
     volume = {5},
     number = {3},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/KYB_1969_5_3_a4/}
}