@article{10_1017_S0017089500031700,
     author = {Zimmermann, Bruno},
     title = {Finite groups of outer automorphisms of free groups},
     journal = {Glasgow mathematical journal},
     pages = {275--282},
     year = {1996},
     volume = {38},
     number = {3},
     doi = {10.1017/S0017089500031700},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500031700/}
}