@article{10_21136_CPMF_1921_122274,
     author = {Rychl{\'\i}k, Karel},
     title = {O kvadratick\'ych t\v{e}lesech \v{c}{\'\i}seln\'ych. {[I.]}},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {49--59},
     publisher = {mathdoc},
     volume = {50},
     number = {1},
     year = {1921},
     doi = {10.21136/CPMF.1921.122274},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1921.122274/}
}