S. Ajitha, T. Kumar, D. Geetha, and K. Kanth. 2010 International Conference on Industrial and Information Systems (ICIIS), page 372--376. IEEE, (August 2010)
Z. Pintarič. Process Safety and Environmental Protection (Transactions of the
Institution of Chemical Engineers, Part B), 85 (B1):
23--38(January 2007)