Ph.D. Theses Successfully Defended in the Academic Year 1998/1999 Ph.D. Theses Successfully Defended in the Academic Year 1997/1998 Ph.D. Theses Successfully Defended in the Academic Year 1996/1997 Ph.D. Theses Successfully Defended in the Academic Year 1995/1996 Ph.D. Theses Successfully Defended in the Academic Year 1994/1995