Maximal Inequalities and Lebesgue's Differentiation Theorem for Best Approximant by Constant over Balls. - Fernando Mazzone; Héctor Cuenya (J. Approx. Theory, 2001)

Isotonic Approximation in L1. - Fernando Mazzone; Héctor Cuenya (J. Approx. Theory, 2002)

Best constant approximants in Lorentz spaces. - Fabián E. Levis; Héctor Cuenya (J. Approx. Theory, 2004)

Interpolation and best simultaneous approximation. - Héctor Cuenya; Fabián E. Levis (J. Approx. Theory, 2010)