Preface

  • Fritz Gesztesy

    Baylor University, Waco, USA
  • Harald Hanche-Olsen

    The Norwegian University of Science and Technology, Trondheim, Norway
  • Espen R. Jakobsen

    The Norwegian University of Science and Technology (NTNU), Trondheim, Norway
  • Yurii I. Lyubarskii

    The Norwegian University of Science and Technology, Trondheim, Norway
  • Nils Henrik Risebro

    University of Oslo, Norway
  • Kristian Seip

    Norwegian University of Science and Technology, Trondheim, Norway