@article{IM_1983__71_142986,
     author = {A. Ramanathan},
     title = {Deformations of {Principal} {Bundles} on the {Projective} {Line.}},
     journal = {Inventiones mathematicae},
     pages = {165--192},
     publisher = {mathdoc},
     volume = {71},
     year = {1983},
     zbl = {0492.14007},
     url = {http://geodesic.mathdoc.fr/item/IM_1983__71_142986/}
}