@article{PMFA_2003_48_3_a4,
     author = {Markl, Martin},
     title = {Oper\'ady v~sou\v{c}asn\'e matematice},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {239--250},
     year = {2003},
     volume = {48},
     number = {3},
     zbl = {1247.18006},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_2003_48_3_a4/}
}