1. A review of key environmental and energy performance indicators for the case of renewable energy systems when integrated with storage solutions
2. The Environmental Importance of Energy Use in Chemical Production
3. Science for Environment Policy, Poor Energy Use is Chemical Industry's Top Environmental Issue, European Commission DG Environment News Alert Service , edited by SCU, The University of the West of England , Bristol , News Alert Issue 242 – 9th June 2011, http://ec.europa.eu/environment/integration/research/newsalert/pdf/243na2_en.pdf , accessed 21/12/18
4. L. Brownell , Butterfly wings inspire air-purification improvements , https://news.harvard.edu/gazette/story/2018/03/butterfly-wings-inspire-air-purification-improvements/ , accessed 21/12/2018
5. The Environmental Goods and Services Industry