@article{10_14708_wm_v13i1_2013,
     author = {L. Je\'smanowicz},
     title = {W. {Bie\'nko} {O} r\'ownaniach r\'o\.zniczkowych},
     journal = {Wiadomo\'sci Matematyczne},
     pages = { 136--137},
     publisher = {mathdoc},
     volume = {13},
     number = {1},
     year = {1971},
     doi = {10.14708/wm.v13i1.2013},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/wm.v13i1.2013/}
}