Sampoli, Maria Lucia; Peternell, Martin; Jüttler, Bert Rational surfaces with linear normals and their convolutions with rational surfaces. (English) Zbl 1095.53006 Comput. Aided Geom. Des. 23, No. 2, 179-192 (2006). The authors discuss geometric properties of polynomial (or rational) parametrized surfaces with linear fields of normal vectors. It is shown that these are projectively dual to graphs of bivariate polynomials (or rational functions). This dual representation is applied to prove that the convolution of rational surfaces with linear normal vector fields with general rational surfaces is again rational. 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