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Advances in Intelligent and Soft Computing > Nonlinear Mathematics for Uncertainty and its Applications > 51-59
Journal of Mathematical Economics > 2008 > 44 > 7-8 > 836-852
Mathematical Notes > 2007 > 82 > 1-2 > 104-109
Mathematical Notes > 2005 > 77 > 1-2 > 232-245
Mathematical Notes > 2005 > 77 > 1 > 232-245
Southeast Asian Bulletin of Mathematics > 2000 > 24 > 1 > 65-72