Eser, A. (2003). Preface. In A. Biehler, R. Kniebühler, J. Lelieur-Fischer, & S. Stein, Freiburg Proposal on Concurrent Jurisdictions and the Prohibition of Multiple Prosecutions in the European Union (pp. 1–5) forschung aktuell - research in brief. Freiburg i. Br.: edition iuscrim.