Mapping tori of free group automorphisms are coherent. Feighn, Mark; Handel, Michael — 1999 Annals of Mathematics. Second Series
The Tits alternative for Out ( F n ) . I: Dynamics of exponentially-growing automorphisms. Bestvina, Mladen; Feighn, Mark; Handel, Michael — 2000 Annals of Mathematics. Second Series
The Grushko decomposition of a finite graph of finite rank free groups: an algorithm. Diao, Guo-An; Feighn, Mark — 2005 Geometry & Topology
Bounding the complexity of simplicial group actions on trees. Mladen Bestvina; Mark Feighn — 1991 Inventiones mathematicae