@article{CMUC_1991__32_2_a1,
     author = {Pudl\'ak, Pavel and Vav\v{r}{\'\i}n, Zden\v{e}k},
     title = {Computation of rigidity of order $\frac{n^2}r$ for one simple matrix},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {213--218},
     publisher = {mathdoc},
     volume = {32},
     number = {2},
     year = {1991},
     mrnumber = {1137781},
     zbl = {0753.15011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1991__32_2_a1/}
}