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Journal of Mathematical Analysis and Applications > 2008 > 341 > 1 > 1-11
Demonstratio Mathematica > 2008 > Vol. 41, nr 3 > 651-659
Journal of Mathematical Analysis and Applications > 2008 > 341 > 1 > 1-11
Demonstratio Mathematica > 2008 > Vol. 41, nr 3 > 651-659