@misc{PMFA_2021_66_4_a5,
     title = {Jubilea},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {271--272},
     year = {2021},
     volume = {66},
     number = {4},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_2021_66_4_a5/}
}