@article{10_21136_CPMF_1912_122921,
     author = {Rychl{\'\i}k, V.},
     title = {Invarianty kvatern\'arn{\'\i} grupy kollineac{\'\i} \v{r}\'adu 2520},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {478--487},
     publisher = {mathdoc},
     volume = {41},
     number = {3-4},
     year = {1912},
     doi = {10.21136/CPMF.1912.122921},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1912.122921/}
}