@article{KYB_1995_31_2_a5,
     author = {Demel, Ji\v{r}{\'\i} and Demlov\'a, Marie},
     title = {On one {NP-complete} problem},
     journal = {Kybernetika},
     pages = {207--211},
     year = {1995},
     volume = {31},
     number = {2},
     mrnumber = {1334510},
     zbl = {0859.68038},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KYB_1995_31_2_a5/}
}