@article{701661,
     title = {G-connections as twisted formal solutions of systems of PDE's related to geometric structures},
     booktitle = {Proceedings of the 19th Winter School "Geometry and Physics"},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {2000},
     pages = {177-186},
     mrnumber = {MR1764093},
     zbl = {0986.53007},
     url = {http://dml.mathdoc.fr/item/701661}
}

Ortaçgil, Ercüment. G-connections as twisted formal solutions of systems of PDE's related to geometric structures, dans Proceedings of the 19th Winter School "Geometry and Physics", GDML_Books,  (2000), pp. 177-186. http://gdmltest.u-ga.fr/item/701661/