Malnormal subgroups and Frobenius groups: basics and examples
  Malnormal subgroups occur in various contexts. We review a large number of examples, and we compare the situation in this generality to that of finite Frobenius groups of permutations. In a companion paper [HaWe], we analyse when peripheral subgroups of knot groups and 3-manifold groups are malnormal. 
Pierre de la Harpe and Claude Weber, Appendix by Denis Osin
math.GR