by Meier, D.C., Taylor, C.J., Cavicchi, R.E., V, E.W., Ellzy, M.W., Sumpter, K.B., Semancik, S.
Published in IEEE sensors journal (01.08.2005)

by Faia, L J, McCannel, C A, Pulido, J S, Hatfield, R M, Hatfield, M E, McNulty, V E W
Published in Eye (London) (01.08.2008)