1. Beaufort wind scale, http://www.kites.org/jo/beaufort.html.
2. Cave, S. (1996). Chemical process route selection based on environmental friendliness. MSc Thesis, Loughborough University, UK.
3. Chemical process route selection based on assessment of inherent environmental hazard;Cave;Computers and Chemical Engineering,1997
4. Chemical process safety: Fundamentals with applications;Crowl,2001
5. Hydrocarbons and the long-range transport of ozone and PAN across Europe;Derwent;Atmospheric Environment,1991