@article{10_2140_agt_2002_2_897,
     author = {Martino, Armando},
     title = {Maximal index automorphisms of free groups with no attracting fixed points on the boundary are {Dehn} twists},
     journal = {Algebraic and Geometric Topology},
     pages = {897--919},
     year = {2002},
     volume = {2},
     number = {2},
     doi = {10.2140/agt.2002.2.897},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/agt.2002.2.897/}
}