@article{ARM_2003__39_1_a5,
     author = {Pan\'ak, Martin},
     title = {Natural operators in the view of {Cartan} geometries},
     journal = {Archivum mathematicum},
     pages = {57--75},
     publisher = {mathdoc},
     volume = {39},
     number = {1},
     year = {2003},
     mrnumber = {1982212},
     zbl = {1112.58301},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_2003__39_1_a5/}
}