A Remark on Non-Uniform Hyperplanes of Finite Thick Dual Polar Spaces. - Harm Pralle (Eur. J. Comb., 2001)

The Hyperplanes of DW(5, 2). - Harm Pralle (Exp. Math., 2005)

The exceptional hyperplanes of DH(5, 4). - Bart De Bruyn; Harm Pralle (Eur. J. Comb., 2007)

On Small and Large Hyperplanes of DW (5, q ). - Bart De Bruyn; Harm Pralle (Graphs Comb., 2007)

The hyperplanes of the near hexagon on the 2-factors of the complete graph K8. - Bart De Bruyn; Harm Pralle (Discret. Math., 2008)