1. Institute of Transport Economics, Gaustadalleen 21, 0349 Oslo, Norway
2. Department of Economics, Stockholm School of Economics in Riga, Baltic International Centre for Economic Policy Studies, Strelnieku iela 4a, 1010 Riga, Latvia
3. School of Economics and Business Administration, University of Tartu, Narva mnt. 18, 51009 Tartu, Estonia
4. Business Law Department, Faculty of Law, Vilnius University, Saulėtekio al. 9—I rūmai, 10222 Vilnius, Lithuania