@article{10_14708_wm_v15i1_943,
     author = {S. S\k{e}dziwy},
     title = {J. {Kudrewicz} {Cz\k{e}stotliwo\'sciowe} metody w teorii nieliniowych uk{\l}ad\'ow dynamicznych},
     journal = {Wiadomo\'sci Matematyczne},
     pages = { 130--132},
     publisher = {mathdoc},
     volume = {15},
     number = {1},
     year = {1972},
     doi = {10.14708/wm.v15i1.943},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v15i1.943/}
}