@article{AUPCDM_2017_9_1_a6,
     author = {Zieli\'nski, Marcin},
     title = {O ilo\'sci nier\'ownowa\.znych metryk},
     journal = {Annales Universitatis Paedagogicae Cracoviensis. Studia ad Didacticam Mathematicae Pertinentia},
     pages = {139--152},
     year = {2017},
     volume = {9},
     number = {1},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/AUPCDM_2017_9_1_a6/}
}