A central topic in CAGD is the representation of curves and surfaces by polynomial interpolation operators, in particular by Bernstein polynomials. In this paper we present two different types of generalized Bernstein polynomials. The first one goes back to an idea of D.D.Stancu [5, 6, 7]; here a class of polynomials qnv is defined, which depend continuously on an additional parameter a. For a
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