@article{701444,
     title = {Some invariants of Lie algebroids of principal fibre bundles},
     booktitle = {Proceedings of the Winter School "Geometry and Physics"},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {1989},
     pages = {[235]-258},
     mrnumber = {MR1009576},
     zbl = {0678.55011},
     url = {http://dml.mathdoc.fr/item/701444}
}

Kubarski, Jan. Some invariants of Lie algebroids of principal fibre bundles, dans Proceedings of the Winter School "Geometry and Physics", GDML_Books,  (1989), pp. [235]-258. http://gdmltest.u-ga.fr/item/701444/