@article{701411,
     title = {Connection theory and parameter transformations},
     booktitle = {Proceedings of the Winter School "Geometry and Physics"},
     series = {GDML\_Books},
     publisher = {Circolo Matematico di Palermo},
     address = {Palermo},
     year = {1987},
     pages = {[85]-99},
     mrnumber = {MR0946714},
     zbl = {0642.53034},
     url = {http://dml.mathdoc.fr/item/701411}
}

Kis, Bela. Connection theory and parameter transformations, dans Proceedings of the Winter School "Geometry and Physics", GDML_Books,  (1987), pp. [85]-99. http://gdmltest.u-ga.fr/item/701411/