@article{AUPCDM_2009_2_1_a10,
     author = {Matczyk, Agata and Mityushev, Vladimir and Pow\k{a}zka, Zbigniew},
     title = {O zastosowaniu sumowania wed{\l}ug {Eisensteina} do pewnej sumy podw\'ojnej},
     journal = {Annales Universitatis Paedagogicae Cracoviensis. Studia ad Didacticam Mathematicae Pertinentia},
     pages = {153--157},
     publisher = {mathdoc},
     volume = {2},
     number = {1},
     year = {2009},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/AUPCDM_2009_2_1_a10/}
}