@article{AUPCDM_2013_5_1_a4,
     author = {G\'orowski, Jan and {\L}omnicki, Adam},
     title = {Prime counting function \ensuremath{\pi}},
     journal = {Annales Universitatis Paedagogicae Cracoviensis. Studia ad Didacticam Mathematicae Pertinentia},
     pages = {71--76},
     publisher = {mathdoc},
     volume = {5},
     number = {1},
     year = {2013},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/AUPCDM_2013_5_1_a4/}
}