Fopke Klok Two moving coordinate frames for sweeping along a 3D trajectory. [Citation Graph (0, 0)][DBLP] Computer Aided Geometric Design, 1986, v:3, n:3, pp:217-229 [Journal]
Fopke Klok Evaluation of Standard Graphics Packages. [Citation Graph (0, 0)][DBLP] Comput. Graph. Forum, 1987, v:6, n:4, pp:299-308 [Journal]