Martin Berlakovich, Mario Ruthmair, Günther R. Raidl. A Multilevel Heuristic for the Rooted Delay-Constrained Minimum Spanning Tree Problem. Proceedings of the 13th International Conference on Computer Aided Systems Theory: Part I (R. Moreno-D'iaz and F. Pichler and A. Quesada-Arencibia), volume 6927 of LNCS, pages 256-263, 2012, Springer.