@article{10_14708_wm_v19i01_3257,
     author = {. .},
     title = {Zadania},
     journal = {Wiadomo\'sci Matematyczne},
     pages = { 61--68},
     year = {1975},
     volume = {19},
     number = {01},
     doi = {10.14708/wm.v19i01.3257},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v19i01.3257/}
}