1. Alibaba. Available from: http://price.alibaba.com/price/priceLeafCategory.htm?spuId=100073989&categoryId=100001625 Cited 18.04.12.
2. Alibaba. Available from: http://www.alibaba.com/product-gs/558966580/Platinum_Alumina_Catalyst.html Cited 18.07.12.
3. Aspen Technology, Inc. (2011a). Aspen Plus V7.3 (25.0.4987).
4. Aspen Technology, Inc. (2011b). Aspen Process Economic Analyzer V.7.3.1 (19.0.0.2556).
5. Aspen Technology, Inc. (2012). Aspen Plus Help.