@article{MAPO_2017_4_1_a6,
     author = {Czy\.zewska, Jadwiga},
     title = {Kolorowanie p{\l}aszczyzny, prostych i okr\k{e}g\'ow},
     journal = {Matematyka Pogl\k{a}dowa},
     pages = {30--31},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {2017},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/MAPO_2017_4_1_a6/}
}