@article{BAG_1981__11_138188,
     author = {D. KRUPKA},
     title = {Finite order liftings in principal fibre bundles},
     journal = {Beitr\"age zur Algebra und Geometrie},
     pages = {21--28},
     publisher = {mathdoc},
     volume = {11},
     year = {1981},
     url = {http://geodesic.mathdoc.fr/item/BAG_1981__11_138188/}
}