@article{PMFA_1971_16_2_a6,
     author = {Mikul\v{c}\'ak, Ji\v{r}{\'\i}},
     title = {Zentralblatt f\"ur {Didaktik} der {Mathematik}},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {91--94},
     year = {1971},
     volume = {16},
     number = {2},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1971_16_2_a6/}
}