@article{MM2_1987__59_155257,
     author = {K.-H. Ulbrich},
     title = {Galois extensions as functors of comodules.},
     journal = {Manuscripta mathematica},
     pages = {391--398},
     publisher = {mathdoc},
     volume = {59},
     year = {1987},
     zbl = {0634.16027},
     url = {http://geodesic.mathdoc.fr/item/MM2_1987__59_155257/}
}