Analysis and computation of (n,N)-strategies for maintenance of a two-component system / F.A. van der Duyn Schouten, S.G. VannesteTwo simple control policies for a multicomponent maintenance system / Frank A. van der Duyn Schouten, Stephan G. VannesteEquilibrium and transient system effectiveness of a production unit with an output buffer / P.R. de Waal, S.G. Vanneste