@article{10_14708_wm_v13i1_1985,
     author = {M. Kac},
     title = {Czy mo\.zna us{\l}ysze\'c kszta{\l}t b\k{e}bna},
     journal = {Wiadomo\'sci Matematyczne},
     pages = { 11--35},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {1971},
     doi = {10.14708/wm.v13i1.1985},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v13i1.1985/}
}