REFERENCES
- Baumslag , G. , Myasnikov , A.G. and Shpilrain , V. 1999 . Open Problems in Combinatorial Group theory . Contemp. Math. , 250 : 1 – 27 .
- Ivanov , S.V. 1999 . On Endomorphisms of Free Groups that Preserve Primitivity . Arch. Math. , 72 : 92 – 100 .
- Lyndon , R.C. and Schupp , P.E. 1977 . Combinatorial Group Theory New York/Berlin : Springer-Verlag .
- McCool , J. 1974 . A Presentation for the Automorphism Group of a Free Group of Finite Rank . J. London Math. Soc. , 8 : 259 – 266 .
- Shpilrain , V. 1994 . Recognizing Automorphisms of the Free Groups . Arch. Math. , 62 : 385 – 392 .
- Shpilrain , V. 1998 . Generalized Primitive Elements of a Free Group . Arch. Math. , 71 : 270 – 278 .
- Whitehead , J.H.C. 1936 . Equivalent Sets of Elements in a Free Group . Ann. of Math. , 37 : 782 – 800 .