1. Hourihane E.G.: Continuous product quality inspection of rubber tape on a high speed packing machine. M.Tech. Thesis University of Limerick, Ireland, 1990.
2. Batchellor BG, Hill DA, Hodgson DC: Automated visual inspection. IFS (Publications) Ltd., UK.
3. Garret JD: Survey of displacement transducers below 50 mm, J. Phys. E:Sci. Instrument, 12, P 563-564, 1979.
4. Zuech N, Miller R: Machine Vision, Fairmount Press inc.
5. Jones : Instrument Technology volume 1 mechanical measurements, Butterworths.