@article{10_21136_CPMF_1908_122978,
     author = {Petr, Karel},
     title = {O rovnic{\'\i}ch differenci\'aln{\'\i}ch pro invariantn{\'\i} \'utvary},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {261--276},
     publisher = {mathdoc},
     volume = {37},
     number = {3},
     year = {1908},
     doi = {10.21136/CPMF.1908.122978},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1908.122978/}
}