Doctoral thesis (2014) - G.R. Kottayi Pilappara (author), P.C.M. Planken (supervisor), L Kuipers (advisor), PU Jepsen (advisor), H. P. Urbach (advisor), HP Urbach (advisor), H.P. Urbach (advisor), Paul Urbach (advisor), A. Neto (advisor), Andrea Neto (advisor), Aurele Adam (advisor), A.J.L. Adam (advisor), J. Caro (advisor)