1. GU Frankfurt, Germany. schauss@ki.cs.uni-frankfurt.de
2. RISC, JKU Linz, Austria. kutsia@risc.jku.at
3. IIIA - CSIC, Spain. levy@iiia.scic.es
4. IMA, Universitat de Girona, Spain. villaret@ima.udg.edu
5. GU Frankfurt, Germany. kutz@ki.cs.uni-frankfurt.de