1. A.G. Hahn, R.J.N. Helmer, T. Kelly, K. Partridge, A. Krajewski, I. Blanchonette, J. Barker, H. Bruch, M.Brydon, N. Hooke and B.Andreass, Proc. 8th Conf ISEA,(2010).
2. Patent Application no. 2009905275.
3. R.J.N. Helmer, D. Farrow, S.R. Lucas, G.J Higgerson, I. Blanchonette, Proc. 8th Conf ISEA (2010).
4. AS 2001.5.4 -2005 / ISO 6330:2000.