@misc{PMFA_1991_36_4_a5,
     title = {Jubilea a zpr\'avy},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {242--246},
     year = {1991},
     volume = {36},
     number = {4},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1991_36_4_a5/}
}