Doctoral thesis (2003) - TE Motoasca (author) , H Blok (promotor) , PM van den Berg (copromotor) , M.D. Verweij (copromotor) , Johan Smit (copromotor) , R van Keer (copromotor) , BP de Hon (copromotor) , WC Emmens (copromotor) , J. A. Ferreira (copromotor)