@article{RMF_2021_96_4_a0,
     author = {Dlab, Vlastimil},
     title = {Obsah a obvod obd\'eln{\'\i}k\r{u}},
     journal = {Rozhledy matematicko-fyzik\'aln{\'\i}},
     pages = {1--8},
     year = {2021},
     volume = {96},
     number = {4},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/RMF_2021_96_4_a0/}
}