Invariants under image perspective transformations: Theory and examples. - Eamon B. Barrett; Paul M. Payton; Michael H. Brill; Nils N. Haag (Int. J. Imaging Syst. Technol., 1990)

General methods for determining projective invariants in imagery. - Eamon B. Barrett; Paul M. Payton; Nils N. Haag; Michael H. Brill (CVGIP Image Underst., 1991)

Some invariant linear methods in photogrammetry and model-matching. - Eamon B. Barrett; Michael H. Brill; Nils N. Haag; Paul M. Payton (CVPR, 1992)

Representation of Three-Dimensional Object Structure as Cross-Ratios of Determinants of Stereo Image Points. - Eamon B. Barrett; Gregory Gheen; Paul M. Payton (Applications of Invariance in Computer Vision, 1993)

Geometric Invariants for Rational Polynomial Cameras. - Eamon B. Barrett; Paul M. Payton (AIPR, 2000)