@misc{PMFA_1991_36_4_a6,
     title = {Nov\'e knihy},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {247--[248a]},
     year = {1991},
     volume = {36},
     number = {4},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1991_36_4_a6/}
}