Foreword.- Fixed Points of Endomorphisms.- Context-Free Groups and Bass-Serre Theory.- Hyperbolic Structures on Surfaces and Geodesic Currents.
                                                  Javier Aramayona is a Professor at the Departamento de Matemáticas of the Universidad Autónoma de Madrid, Spain.
Volker Diekert is the Head of the Theoretical Computer Science Group at the University of Stuttgart, Germany.
Christopher J. Leininger is a Professor of Mathematics at the University of Illinois at Urbana-Champaign, USA.
Pedro V. Silva is a full Professor of the Department of Mathematics of the University of Porto, Portugal.
Armin Weiβ is a Research Assistant in the Theoretical Computer Science Group at the University of Stuttgart, Germany.