@article{CMUC_1989__30_4_a18,
     author = {Kratochv{\'\i}l, Jan and Matou\v{s}ek, Ji\v{r}{\'\i}},
     title = {NP-hardness results for intersection graphs},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {761--773},
     publisher = {mathdoc},
     volume = {30},
     number = {4},
     year = {1989},
     mrnumber = {1045907},
     zbl = {0697.05052},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1989__30_4_a18/}
}