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Revista de la Real Academia de Ciencias Exactas, Físicas y Naturales.... > 2019 > 113 > 3 > 2001-2015
Journal of Contemporary Mathematical Analysis (Armenian Academy of Sciences) > 2013 > 48 > 6 > 297-309
Demonstratio Mathematica > 2012 > Vol. 45, nr 1 > 39-50
Applied Mathematics and Computation > 2007 > 187 > 1 > 35-46