@article{10_21136_CPMF_1939_109443,
     author = {Petr, Karel},
     title = {Pozn\'amka o kvadratick\'ych form\'ach},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {162--173},
     publisher = {mathdoc},
     volume = {68},
     number = {3-4},
     year = {1939},
     doi = {10.21136/CPMF.1939.109443},
     zbl = {0021.09905},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1939.109443/}
}