@article{10_14708_cm_v23i2_6068,
     author = {D. Szynal and A. Woli\'nska},
     title = {On classes of couples of characteristic furictions satisfying the condition of {Dugu\'e}},
     journal = {Commentationes Mathematicae},
     pages = { 325--328},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {1983},
     doi = {10.14708/cm.v23i2.6068},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v23i2.6068/}
}