@article{PMFA_2022_67_4_a2,
     author = {Proner, Mat\'u\v{s} and Slav{\'\i}k, Anton{\'\i}n},
     title = {\'Ulohy o klobouc{\'\i}ch},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {233--246},
     year = {2022},
     volume = {67},
     number = {4},
     zbl = {07729603},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_2022_67_4_a2/}
}