Authors: Thiery, Michel --- Derom, M. J. --- Van Kets, Henry E. --- De Schaepdryver, André F. --- Bernard, Paul J. --- et al. Bekaert, Stephane A. L. --- Hooft, Carlos --- Derom, Fritz --- Rolly, Georges --- Roels, Hendrik J. L.
Year: 1967 Publisher: S.l. : s.n.,