Doctoral thesis (2009) - A Vrijdag (author) , Douwe Stapersma (promotor) , Thomas Van Terwisga (copromotor) , M Atlar (copromotor) , H Rulfs (copromotor) , J Klein Woud (copromotor) , O.H. Bosgra (copromotor) , HT Grimmelius (copromotor) , J.J. Hopman (copromotor)