@article{CMH_1990__65_3_140201,
     author = {Robert J. Zimmer},
     title = {On the algebraic hull of an automorphism group of a principal bundle.},
     journal = {Commentarii mathematici Helvetici},
     pages = {375--387},
     publisher = {mathdoc},
     volume = {65},
     number = {3},
     year = {1990},
     zbl = {0733.54028},
     url = {http://geodesic.mathdoc.fr/item/CMH_1990__65_3_140201/}
}