Codimension-one minimal projections onto Haar subspaces. - Grzegorz Lewicki; Michael Prophet (J. Approx. Theory, 2004)

Minimal shape-preserving projections in tensor product spaces. - Grzegorz Lewicki; Michael Prophet (J. Approx. Theory, 2010)

Codimension 1 minimal projections onto the lines in Lp. - Grzegorz Lewicki; Michael Prophet (J. Approx. Theory, 2022)