Master Thesis:                      "Random walk in random environment"
                                         (supervised by Dr Krzysztof Topolski), University of Wroclaw, Poland, 1993


Doctoral Dissertation:     "Bounds for steady-state buffer content in the fluid models"
                                      (supervised by Prof. Tomasz Rolski), with distinction, University of Wroclaw, Poland, 1999


Habilitation:     "Martingale methods and properties of subexponential distributions
                                      in fluctuations of Lévy processes and random walks"
                                      University of Wroclaw, Poland, 2007