@article{701764,
     title = {Two constructions with parabolic geometries},
     booktitle = {Proceedings of the 25th Winter School "Geometry and Physics"},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {2006},
     pages = {[11]-37},
     mrnumber = {MR2287124},
     zbl = {1120.53013},
     url = {http://dml.mathdoc.fr/item/701764}
}

Čap, Andreas. Two constructions with parabolic geometries, dans Proceedings of the 25th Winter School "Geometry and Physics", GDML_Books,  (2006), pp. [11]-37. http://gdmltest.u-ga.fr/item/701764/