@article{AUPCDM_2009_2_1_a2,
     author = {Chronowski, Antoni and Major, Joanna and Pow\k{a}zka, Zbigniew},
     title = {O r\'o\.znych sposobach definiowania warto\'s\'c bezwzgl\k{e}dnej},
     journal = {Annales Universitatis Paedagogicae Cracoviensis. Studia ad Didacticam Mathematicae Pertinentia},
     pages = {29--36},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {2009},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/AUPCDM_2009_2_1_a2/}
}