@article{10_4064_ap92_1_9,
     author = {Miroslav Doupovec and W/lodzimierz M. Mikulski},
     title = {Gauge natural constructions on
 higher order principal prolongations},
     journal = {Annales Polonici Mathematici},
     pages = {87--97},
     publisher = {mathdoc},
     volume = {92},
     number = {1},
     year = {2007},
     doi = {10.4064/ap92-1-9},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap92-1-9/}
}