Humphreys, Kenneth, Ward, Tomas E. and Markham, Charles (2007) Noncontact simultaneous dual wavelength photoplethysmography: a further step toward noncontact pulse oximetry. The Review of Scientific Instruments, 78 (4).

Cahill, Niall M., Cooney, Rory, Humphreys, Kenneth and Lawlor, Bob (2006) Demixing of Speech Mixtures and Enhancement of Noisy Speech Using ADRess Algorithm. In: IET Irish Signals and Systems Conference, 2006. IEEE, pp. 533-538. ISBN 0863416659

Humphreys, Kenneth, Markham, Charles and Ward, Tomas E. (2005) A CMOS camera-based system for clinical photoplethysmographic applications. Proceedings of SPIE, 5823. pp. 88-95.

Loughran, John, Murphy, J.Anthony, Lanigan, William, Cartwright, E., May, Robert K., Ward, Tomas E., Humphreys, Kenneth and Markham, Charles (2004) Novel Optical Design for Terahertz Imaging Applications. In: Conference Digest of the 2004 Joint 29th International Conference on Infrared and Millimeter Waves, 2004 and 12th International Conference on Terahertz Electronics, 2004. 10.1109/ICIMW.2004.1422191 . IEEE, pp. 517-518. ISBN 0780384903