Shape encoding: a biologically inspired method of transforming boundary images into ensembles of shape-related features. - Gert J. van Tonder; J. J. Kruger (IEEE Trans. Syst. Man Cybern. Part B, 1997)

Intermediate Level Shape Processing. - Gert J. van Tonder; Yoshimichi Ejima (ICONIP, 1998)

The patchwork engine: image segmentation from shape symmetries. - Gert J. van Tonder; Yoshimichi Ejima (Neural Networks, 2000)

Calming visual spaces: learning from Kyoto Zen gardens. - Michael J. Lyons 001; Gert J. van Tonder; Ian Shortreed; Nobuji Tetsutani (SIGGRAPH Abstracts and Applications, 2002)

Flexible computation of shape symmetries within the maximal disk paradigm. - Gert J. van Tonder; Yoshimichi Ejima (IEEE Trans. Syst. Man Cybern. Part B, 2003)

Recovery of visual structure in illustrated Japanese gardens. - Gert J. van Tonder (Pattern Recognit. Lett., 2007)