Authors: Brouwer, G.A. --- Van Dieren, J.W. --- Feekes, W. --- Harmsen, G.W. --- ten Houten, J. G.. --- et al. Kabos, W.J. --- Mazure, J. P.. --- Scheygrond, A. --- Tesch, P. --- Van der Werff, A.
Year: 1950 Publisher: 's-Gravenhage Martinus Nijhoff