Aaron Williams. Loopless generation of multiset permutations using a constant number of variables by prefix shifts. In Claire Mathieu, editor, Proceedings of the Twentieth Annual ACM-SIAM Symposium on Discrete Algorithms, SODA 2009, New York, NY, USA, January 4-6, 2009. pages 987-996, SIAM, 2009. [doi]
Abstract is missing.