@article{10_14708_cm_v28i2_6235,
     author = {P. Hitczenko},
     title = {On a conjecture of {J.} {Zinn}},
     journal = {Commentationes Mathematicae},
     pages = { 219--222},
     year = {1989},
     volume = {28},
     number = {2},
     doi = {10.14708/cm.v28i2.6235},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v28i2.6235/}
}