Semi Purhonen
Department of Social Research
PO Box 18 (Snellmaninkatu 10)
00014 University of Helsinki
Finland
E-mail: semi.purhonen(at)helsinki.fi
Semi Purhonen
Department of Social Research
PO Box 18 (Snellmaninkatu 10)
00014 University of Helsinki
Finland
E-mail: semi.purhonen(at)helsinki.fi