1. FACULTY OF EEMCS; UNIVERSITY OF TWENTE; ENSCHEDE; THE NETHERLANDS
2. DEPARTMENT OF APPLIED MATHEMATICS; CHARLES UNIVERSITY; PRAGUE CZECH REPUBLIC
3. INSTITUTE OF COMPUTER SCIENCE; UNIVERSITY OF BERGEN; BERGEN NORWAY
4. DEPARTMENT OF MATHEMATICS; INSTITUTE FOR THEORETICAL COMPUTER SCIENCE (CE-ITI) AND THE EUROPEAN CENTRE OF EXCELLENCE NTIS (NEW TECHNOLOGIES FOR THE INFORMATION SOCIETY); UNIVERSITY OF WEST BOHEMIA; PLZEŇ CZECH REPUBLIC
5. SCHOOL OF ENGINEERING AND COMPUTING SCIENCES; DURHAM UNIVERSITY; UNITED KINGDOM
6. DEPARTMENT OF COMPUTER SCIENCE; UNIVERSITY OF OREGON; EUGENE OR 97403