Warren Dicks and Enric Ventura, The group fixed by a family of injective endomorphisms of a free group. Contemporary Math., 195. American Mathematical Society, Providence, RI, 1996. x+81pp. ISBN: 0-8218-0564-9. 
April 21, 2009 edition of Errata and addenda, 2 pages, available as 79K PDF file.
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