@article{10_14708_wm_v29i02_4504,
     author = {K. Ciesielski and Z. G\k{a}siorek and A. Pelczar and ZPogod ZPogoda and E. Tutaj},
     title = {Encyklopedia szkolna. {Matematyka}},
     journal = {Wiadomo\'sci Matematyczne},
     pages = { 307--312},
     publisher = {mathdoc},
     volume = {29},
     number = {02},
     year = {1992},
     doi = {10.14708/wm.v29i02.4504},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v29i02.4504/}
}