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International Journal of Approximate Reasoning > 2008 > 49 > 1 > 198-211
Open Mathematics > 2007 > 5 > 2 > 264-279
Central European Journal of Mathematics > 2007 > 5 > 2 > 264-279
International Journal of Approximate Reasoning > 2008 > 49 > 1 > 198-211
Open Mathematics > 2007 > 5 > 2 > 264-279
Central European Journal of Mathematics > 2007 > 5 > 2 > 264-279