@article{10_4064_ap81_3_4,
     author = {W. M. Mikulski},
     title = {The natural operators lifting projectable vector fields
  to some fiber product preserving bundles},
     journal = {Annales Polonici Mathematici},
     pages = {261--271},
     publisher = {mathdoc},
     volume = {81},
     number = {3},
     year = {2003},
     doi = {10.4064/ap81-3-4},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap81-3-4/}
}