A Neural Architecture for Emergent Visual Contrast, Brightness, and Space Perception. - Ian R. Billups; Heiko Neumann; H. Siegfried Stiehl; Lothar Wieske (DAGM-Symposium, 1993)

Towards a method for parametrizing models of early vision using psychophysical data. - Ela Claridge; Ian R. Billups (Image Vis. Comput., 1998)