Normal forms and periodic solutions in the theory of nonlinear oscillations : existence and asymptotic theory / C.G.A. van der BeekAnalysis of a system of two weakly non-linear coupled harmonic oscillators arising from the field of wind-induced vibrations / C.G.A. van der BeekNormal forms for weakly non-linear perturbed wave equations / C.G.A. van der BeekDynamics of an oscillator with three-degrees-of-freedom in a uniform windfield / C.G.A. van der BeekAsymptotic analysis of wind-induced vibrations / Clemens Georges Andreas van der Beek