@article{MAN_1989__284_4_164578,
     author = {Jeremy Teitelbaum},
     title = {On {Drinfeld's} universal formal group over the p-adic upper half plane.},
     journal = {Mathematische Annalen},
     pages = {647--674},
     publisher = {mathdoc},
     volume = {284},
     number = {4},
     year = {1989},
     zbl = {0682.14032},
     url = {http://geodesic.mathdoc.fr/item/MAN_1989__284_4_164578/}
}