Kalman Filtering from a Phase Based Optical Flow Operator. - James R. Cooper; Robert O. Hastings (Australian Joint Conference on Artificial Intelligence, 1997)

Ridge Enhancement in Fingerprint Images Using Oriented Diffusion. - Robert O. Hastings (DICTA, 2007)

Disambiguation of Fingerprint Ridge Flow Direction - Two Approaches. - Robert O. Hastings (SCIA, 2009)