@article{CMJ_2005_55_4_a6,
     author = {Doupovec, Miroslav},
     title = {On the underlying lower order bundle functors},
     journal = {Czechoslovak Mathematical Journal},
     pages = {901--916},
     year = {2005},
     volume = {55},
     number = {4},
     mrnumber = {2184371},
     zbl = {1081.58001},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMJ_2005_55_4_a6/}
}