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Demonstratio Mathematica > 2018 > Vol. 51, nr 1 > 304--308
Mathematische Zeitschrift > 2016 > 283 > 1-2 > 157-167
Journal of Mathematical Analysis and Applications > 2015 > 421 > 1 > 51-58
Journal of Mathematical Analysis and Applications > 2014 > 420 > 1 > 758-771
Journal of Functional Analysis > 2014 > 267 > 1 > 214-242
Journal of Mathematical Analysis and Applications > 2014 > 412 > 2 > 697-719
Journal of Functional Analysis > 2012 > 262 > 1 > 124-166
Journal of Applied Mathematics and Computing > 2010 > 34 > 1-2 > 317-328
Demonstratio Mathematica > 2009 > Vol. 42, nr 3 > 581-598
Demonstratio Mathematica > 2008 > Vol. 41, nr 3 > 651-659
Mathematical Notes > 2006 > 79 > 5-6 > 697-706
Mathematical Notes > 2006 > 79 > 5 > 697-706
Mathematical Notes > 2004 > 76 > 3-4 > 478-489
Demonstratio Mathematica > 2004 > Vol. 37, nr 2 > 393--406
Demonstratio Mathematica > 2004 > Vol. 37, nr 3 > 597--600
Science China Mathematics > 2003 > 46 > 2 > 245-250
Journal of Approximation Theory > 2002 > 116 > 1 > 126-140