1. Modern Techniques of Surface Science;Wooduff,1989
2. Leisk Engineering Limited, Albert Drive, Burgess Hill, West Sussex, RH15 9NX, UK.
3. Quality Air Management Limited, Unit 10, Swan Business Centre, Station Road, Hailsham, East Sussex BN27 2BY, UK.
4. Hiden Analytical Limited, 231 Europa Boulevard, Gemini Business Park, Warrington WA5 5TN, UK.