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Applied Mathematics and Computation > 2013 > 219 > 12 > 7000-7011
Applied Mathematics and Computation > 2008 > 203 > 2 > 838-842
Demonstratio Mathematica > 2005 > Vol. 38, nr 3 > 567--578
Applied Mathematics and Computation > 2013 > 219 > 12 > 7000-7011
Applied Mathematics and Computation > 2008 > 203 > 2 > 838-842
Demonstratio Mathematica > 2005 > Vol. 38, nr 3 > 567--578