@article{10_14708_cm_v3i1_5426,
     author = {J. Perkal},
     title = {O e-aureolach},
     journal = {Commentationes Mathematicae},
     pages = { 73--82},
     publisher = {mathdoc},
     volume = {3},
     number = {1},
     year = {1959},
     doi = {10.14708/cm.v3i1.5426},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v3i1.5426/}
}