Alessandro Zanarini, Gilles Pesant. Generalizations of the Global Cardinality Constraint for Hierarchical Resources. In Pascal Van Hentenryck, Laurence A. Wolsey, editors, Integration of AI and OR Techniques in Constraint Programming for Combinatorial Optimization Problems, 4th International Conference, CPAIOR 2007, Brussels, Belgium, May 23-26, 2007, Proceedings. Volume 4510 of Lecture Notes in Computer Science, pages 361-375, Springer, 2007. [doi]
Abstract is missing.