@article{PMFA_1980__25_6_a1,
     author = {Kol\'a\v{r}, Ivan},
     title = {Zamy\v{s}len{\'\i} nad diferenci\'aln\v{e} geometrick\'ym d{\'\i}lem {Eduarda} {\v{C}echa}},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {306--312},
     publisher = {mathdoc},
     volume = {25},
     number = {6},
     year = {1980},
     mrnumber = {0624783},
     zbl = {0449.01011},
     language = {cz},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1980__25_6_a1/}
}