@article{701522,
     title = {On the natural operators transforming vector fields to the $r$-th tensor power},
     booktitle = {Proceedings of the Winter School "Geometry and Topology"},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {1993},
     pages = {[15]-20},
     mrnumber = {MR1283617},
     zbl = {0820.58004},
     url = {http://dml.mathdoc.fr/item/701522}
}

Kolář, Ivan. On the natural operators transforming vector fields to the $r$-th tensor power, dans Proceedings of the Winter School "Geometry and Topology", GDML_Books,  (1993), pp. [15]-20. http://gdmltest.u-ga.fr/item/701522/