Doctoral thesis (2003) - BJ van der Steeg (author) , J.M. Aarts (promotor) , K.P. Hart (copromotor) , Jan van Mill (copromotor) , A Dow (copromotor) , P Simon (copromotor) , Philippe Clement (copromotor) , Eva Coplakova (copromotor) , J. Biemond (copromotor)