@article{PMFA_1974_19_6_a0,
     author = {Fischer, J\'an},
     title = {K 30. v\'yro\v{c}iu {SNP}},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {301--307},
     year = {1974},
     volume = {19},
     number = {6},
     language = {sk},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1974_19_6_a0/}
}