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Bulletin of Mathematical Sciences > 2015 > 5 > 2 > 159-169
Applied Mathematics and Computation > 2014 > 228 > Complete > 162-169
Applied Mathematics Letters > 2011 > 24 > 11 > 1785-1790
Open Mathematics > 2010 > 8 > 2 > 389-398
Central European Journal of Mathematics > 2010 > 8 > 2 > 389-398
Journal of Approximation Theory > 1999 > 100 > 1 > 94-112