@article{PMF_1893_4_1_a0,
     author = {Puzyna, J\'ozef},
     title = {Z teoryi n-krotnych ca{\l}ek okre\'slonych},
     journal = {Prace Matematyczno-Fizyczne},
     pages = {1--30},
     publisher = {mathdoc},
     volume = {4},
     number = {1},
     year = {1893},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/PMF_1893_4_1_a0/}
}