Tamas Szantai
Institute of Mathematics Budapest University of Technology and Economics
Hungary

Tamas Szantai
Institute of Mathematics
Budapest University of Technology and Economics
Muegyetem rkp. 3, Budapest, 1111 HUNGARY
email:szantai@math.bme.hu

Edith Kovacs
Budapest College of Management
Hungary

Edith Kovacs
Department of Methodology
Budapest College of Management
Villanyi ut 11-13, Budapest, 1114 HUNGARY
email:kovacs.edith@avf.hu