@article{MAPO_2015_2_1_a3,
     author = {Gryszka, Karol},
     title = {Szeregi liczbowe a liczba pi},
     journal = {Matematyka Pogl\k{a}dowa},
     pages = {31--33},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {2015},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/MAPO_2015_2_1_a3/}
}