1. Vice-President's Board (Research & Faculty), University of St. Gallen , Varnbüelstrasse 14, 9000 St. Gallen, Switzerland
2. Dept. of Economics, University of Fribourg , Bd. de Pérolles 90, 1700 Fribourg, Switzerland
3. Dept. of Mathematics, Matej Bel University , Tajovskeho 40, 97401 Banská Bystrica, Slovakia