@article{MZ_1994__216_4_174639,
     author = {Bruno Zimmermann and Shicheng Wang},
     title = {The maximum order of finite groups of outer automorphisms of free groups.},
     journal = {Mathematische Zeitschrift},
     pages = {83--88},
     publisher = {mathdoc},
     volume = {216},
     number = {4},
     year = {1994},
     zbl = {0795.20013},
     url = {http://geodesic.mathdoc.fr/item/MZ_1994__216_4_174639/}
}