@article{PMFA_2016_61_1_a6,
     author = {Dlab, Vlastimil},
     title = {Je povrch derivac{\'\i} objemu?},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {69--71},
     year = {2016},
     volume = {61},
     number = {1},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_2016_61_1_a6/}
}