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Applied Mathematics-A Journal of Chinese Universities > 2009 > 24 > 1 > 90-96
Numerical Algorithms > 2009 > 52 > 2 > 257-271
Journal of Mathematical Analysis and Applications > 2007 > 332 > 1 > 97-108
Open Mathematics > 2007 > 5 > 2 > 205-214
Central European Journal of Mathematics > 2007 > 5 > 2 > 205-214