Ah Chung Tsoi, Shu Zhang, Markus Hagenbuchner. Hierarchical Hidden Markov Models: An Application to Health Insurance Data. In Graham J. Williams, Simeon J. Simoff, editors, Data Mining - Theory, Methodology, Techniques, and Applications. Volume 3755 of Lecture Notes in Computer Science, pages 244-259, Springer, 2006. [doi]
Abstract is missing.