Covering nodes by K node-disjoint trees with additional constraints / S.M. Baas, J. Orestes CerdeiraA relaxation method for the set packing problem using polyhedral characteristics / S.M. Baas, M.C. Bonvanie, A.J. VerschoorAlgorithms for finding an optimal matching between a given string and a string generated by a regular grammar / S.M. Baas, P. van SchaikScheduling jobs on parallel machines, each with a unit-capacity buffer / S.M. Baas, W. Kern, W.M. NawijnAlgorithms for finding an optimal matching between a given string and a string generated by a regular grammar / S.M. Baas and P. van Schaik