@misc{PMFA_2020_65_4_a6,
     title = {Jubilea},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {266--268},
     year = {2020},
     volume = {65},
     number = {4},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_2020_65_4_a6/}
}