Storing Line Segments in Partition Trees. - Mark H. Overmars; Haijo Schipper; Micha Sharir (BIT, 1990)

Generating Triangulations of 2-Manifolds. - Haijo Schipper (Workshop on Computational Geometry, 1991)

Dynamic Partition Trees. - Haijo Schipper; Mark H. Overmars (BIT, 1991)

Determining Contractibility of Curves. - Haijo Schipper (SCG, 1992)

A New Technique To Compute Polygonal Schema for 2-Manifolds with Application to Null-homotopy Detection. - Tamal K. Dey; Haijo Schipper (Discret. Comput. Geom., 1995)