Ray Tracing Generalized Cylinders. - Willem F. Bronsvoort; Fopke Klok (ACM Trans. Graph., 1985)

Deformations of Sweep Objects in Solid Modelling. - Frits H. Post; Fopke Klok (Eurographics, 1986)

Two moving coordinate frames for sweeping along a 3D trajectory. - Fopke Klok (Comput. Aided Geom. Des., 1986)

Evaluation of Standard Graphics Packages. - Fopke Klok (Comput. Graph. Forum, 1987)

Corrigendum: Ray Tracing Generalized Cylinders. - Willem F. Bronsvoort; Fopke Klok (ACM Trans. Graph., 1987)