Trautmann, Franz and Kilmer, Beau and Turnbull, Paul J (2013) Further insights into aspects of the EU illicit drugs market: summaries and key findings. Luxembourg: Publications Office of the European Union.

Trautmann, Franz and Rode, Nino and van Gageldonk, Andre and van der Gouwe, Daan and Croes, Esther and Zidar, Romana and Stover, Heino and Gasparic, Mojca and Konec-Juricic, Nusa (2007) Evaluation of substitution maintenance treatment in Slovenia - assessing its quality and efficiency. Utrecht, Ljubljana: Trimbos Institute & Facilty of Social Work, University of Ljubljana.