@misc{PMFA_2021_66_3_a4,
     title = {Zpr\'avy a ozn\'amen{\'\i}},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {193--200},
     year = {2021},
     volume = {66},
     number = {3},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_2021_66_3_a4/}
}