[1] Department of Operations Research,
[2] University of Aarhus,undefined
[3] Bldg. 530,undefined
[4] Ny Munkegade,undefined
[5] DK-8000 Aarhus C,undefined
[6] Denmark (email: atsjan@imf.au.dk)
,undefined
[7] Department of Banking,undefined
[8] University of Mainz,undefined
[9] Jakob-Welder-Weg 9,undefined
[10] D-55128 Mainz,undefined
[11] Germany (email: sandmann@forex.bwl.uni-mainz.de)
,undefined