Fatigue aspects in structural design : proceedings of the international symposium on the occasion of the retirement of Prof. ir. J. de Back, Delft, The Netherlands September 14-15, 1989 / ed. by J. Wardenier, J.H. ReusinkWind tunnel tests and aerodynamic analysis of the wind loads on the Erasmus bascule bridge at Rotterdam / by E. Willemsen and J.H. Reusink