@article{PMFA_1979_24_4_a0,
     author = {Bos\'ak, Juraj},
     title = {Ako bol vyrie\v{s}en\'y probl\'em \v{s}tyroch farieb},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {181--201},
     year = {1979},
     volume = {24},
     number = {4},
     mrnumber = {0549596},
     zbl = {0424.05025},
     language = {sk},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1979_24_4_a0/}
}