@article{PMFA_1978_23_6_a7,
     author = {Rie\v{c}an, Beloslav},
     title = {Na mno\v{z}inov\'u t\'emu},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {338--342},
     year = {1978},
     volume = {23},
     number = {6},
     language = {sk},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1978_23_6_a7/}
}