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A method for computing the approximate combination of belief functions, based on coarsening the frame of discernement, and the fast Moebius transform. The method is described in: lang=EN-GB style='mso-ansi-language:EN-GB'>
A. Ben Yaghlane, T. Denoeux and K. Melloui. Coarsening approximations of belief functions. In S. Benferhat and P. Besnard, Eds, Proceedings of ECQSARU'2001, pages 362-373, Toulouse, September 2001, Springer-Verlag. postcript pdf
T. Denoeux and A. Ben Yaghlane. Approximating the Combination of Belief Functions using the Fast Moebius Transform in a coarsened frame. International Journal of Approximate Reasoning, Vol. 31, No. 1-2, 77-101, 2002. pdf