@article{10_4171_dm_114,
     author = {J\"urgen Hausen},
     title = {A generalization of {Mumford's} geometric invariant theory},
     journal = {Documenta mathematica},
     pages = {571--592},
     year = {2001},
     volume = {6},
     doi = {10.4171/dm/114},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/dm/114/}
}