Repositorio Institucional de la Universidad de Oviedo

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20141912

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The research in this paper was originated by some discussions with Didier Dubois during the 5th SIPTA School on Imprecise Probabilities. His insight and useful suggestions are much appreciated. We would also like to thank the financial support by project MTM2010-17844 and by the Science and Education Ministry FPU grant AP2009-1034, as well as the reviewers for some helpful comments.