delta-homomorphisms from the Borel delta-algebra into the Loeb delta-algebra. - Hermann Render (Ann. Pure Appl. Log., 2001)

Cardinal interpolation with polysplines on annuli. - Ognyan Kounchev; Hermann Render (J. Approx. Theory, 2005)

Polyharmonic splines on grids ℤ x aℤn and their limits. - Ognyan Kounchev; Hermann Render (Math. Comput., 2005)

On real-analytic recurrence relations for cardinal exponential B-splines. - J. M. Aldaz; Ognyan Kounchev; Hermann Render (J. Approx. Theory, 2007)

Convergence of polyharmonic splines on semi-regular grids mathbbZ× a mathbbZn for a®0. - Ognyan Kounchev; Hermann Render (Numer. Algorithms, 2007)

On a new multivariate sampling paradigm and a polyspline Shannon function - Ognyan Kounchev; Hermann Render (CoRR, 2008)

Shape preserving properties of generalized Bernstein operators on Extended Chebyshev spaces. - J. M. Aldaz; Ognyan Kounchev; Hermann Render (Numerische Mathematik, 2009)

Bernstein operators for extended Chebyshev systems. - J. M. Aldaz; Ognyan Kounchev; Hermann Render (Appl. Math. Comput., 2010)

Optimality of generalized Bernstein operators. - J. M. Aldaz; Hermann Render (J. Approx. Theory, 2010)

Convergence of rational Bernstein operators. - Hermann Render (Appl. Math. Comput., 2014)

Nested sequences of rational spaces: Bernstein approximation, dimension elevation, and Pólya-type theorems on positive polynomials. - Rachid Ait-Haddou; Marie-Laurence Mazure; Hermann Render (J. Approx. Theory, 2018)

Interpolation of data functions on parallel hyperplanes. - Ognyan Kounchev; Hermann Render (J. Approx. Theory, 2019)

Error bounds for interpolation with piecewise exponential splines of order two and four. - Ognyan Kounchev; Hermann Render (CoRR, 2020)

Error estimates for interpolation with piecewise exponential splines of order two and four. - Ognyan Kounchev; Hermann Render (J. Comput. Appl. Math., 2021)

Error estimates for harmonic and biharmonic interpolation splines with annular geometry. - Ognyan Kounchev; Hermann Render; Tsvetomir Tsachev (CoRR, 2022)

Fast algorithms for interpolation with L-splines for differential operators L of order 4 with constant coefficients. - Ognyan Kounchev; Hermann Render; Tsvetomir Tsachev (J. Comput. Appl. Math., 2023)

On the critical length conjecture for spherical Bessel functions in CAGD. - Ognyan Kounchev; Hermann Render (CoRR, 2025)