Basic References
- Mladen Bestvina, and Michael Handel, Train tracks and automorphisms of free groups. Annals of Mathematics (2), vol. 135 (1992), no. 1, pp. 1–51
- Warren Dicks, and Enric Ventura. The group fixed by a family of injective endomorphisms of a free group. Contemporary Mathematics, 195. American Mathematical Society, Providence, RI, 1996. ISBN 0-8218-0564-9
- Oleg Bogopolski. Introduction to group theory. EMS Textbooks in Mathematics. European Mathematical Society, Zürich, 2008. ISBN 978-3-03719-041-8
Read more about this topic: Train Track Map
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