A characterization of weighted approximations by the Post-Widder and the Gamma operators, II.

Borislav R. Draganov Kamen G. Ivanov A characterization of weighted approximations by the Post-Widder and the Gamma operators, II. 1805-1851 2010 162 Journal of Approximation Theory 10 http://dx.doi.org/10.1016/j.jat.2009.10.004 db/journals/jat/jat162.html#DraganovI10