@misc{PMFA_1991_36_5_a5,
     title = {Jubilea a zpr\'avy},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {301--[304a]},
     year = {1991},
     volume = {36},
     number = {5},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1991_36_5_a5/}
}