Doctoral thesis (2011) - L Kester (author) , HJ Hultink (promotor) , A Griffin (copromotor) , T Elfring (copromotor) , F Langerak (copromotor) , S.C. Santema (copromotor) , B van Looy (copromotor) , HW Volberda (copromotor) , Jan P.L. Schoormans (copromotor)