@article{10_1007_s10587_014_0146_1,
     author = {Mikulski, W{\l}odzimierz M.},
     title = {On principal connection like bundles},
     journal = {Czechoslovak Mathematical Journal},
     pages = {961--967},
     publisher = {mathdoc},
     volume = {64},
     number = {4},
     year = {2014},
     doi = {10.1007/s10587-014-0146-1},
     mrnumber = {3304791},
     zbl = {06433707},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10587-014-0146-1/}
}