@article{PMF_1910_21_1_a2,
     author = {Sierpi\'nski, Wac{\l}aw},
     title = {Uwaga do twierdzenia {Riemanna} o szeregach warunkowo zbie\.znych},
     journal = {Prace Matematyczno-Fizyczne},
     pages = {17--20},
     year = {1910},
     volume = {21},
     number = {1},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/item/PMF_1910_21_1_a2/}
}