Pseudometrics, distances and multivariate polynomial inequalities. - Len Bos; Norman Levenberg; Shayne Waldron (J. Approx. Theory, 2008)

Uniform approximation by discrete least squares polynomials. - Jean-Paul Calvi; Norman Levenberg (J. Approx. Theory, 2008)

Geometric weakly admissible meshes, discrete least squares approximations and approximate Fekete points. - Len Bos; Jean-Paul Calvi; Norman Levenberg; Alvise Sommariva; Marco Vianello (Math. Comput., 2011)