Plane Motion Groups and Virtual Poincaré Duality of Dimension Two.
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H. Müller, B. Eckman (1982)
Inventiones mathematicae
Beno Eckmann, Peter Linnell (1983)
Commentarii mathematici Helvetici
Frédéric Paulin (1989)
Annales de l'institut Fourier
Nous montrons que le sous-groupe des points fixes d’un automorphisme d’un groupe hyperbolique au sens de M. Gromov est de type fini.
Kunio Murasugi (1985)
Revista Matemática Iberoamericana
Let L = X U Y be an oriented 2-component link in S3. In this paper we will define two different types of polynomials which are ambient isotopic invariants of L. One is associated with a cyclic cover branched along one of their components, an the other is associated with a metabelian cover of L. This invariants are defined for any link unless the linking number lk(X,Y), is ±1.
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