Warsaw University, Warsaw, Poland, – 2005
Oskar Langer University, Wroclaw, Poland, – 1994
Oskar Langer University, Wroclaw, Poland, – 1990
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Warsaw University, Warsaw, Poland, – 2005
Oskar Langer University, Wroclaw, Poland, – 1994
Oskar Langer University, Wroclaw, Poland, – 1990
