On almost everywhere convergence of orthogonal spline projections with arbitrary knots. - Markus Passenbrunner; Alexei Shadrin (J. Approx. Theory, 2014)

Orthogonal projectors onto spaces of periodic splines. - Markus Passenbrunner (J. Complex., 2017)

Extremal distributions of discrepancy functions. - Ralph Kritzinger; Markus Passenbrunner (J. Complex., 2019)

Properties of local orthonormal systems, Part II: Geometric characterization of Bernstein inequalities. - Jacek Gulgowski; Anna Kamont; Markus Passenbrunner (J. Approx. Theory, 2025)