1. For a slightly more detailed version of this review see P. J.Dunn, The importance of Green Chemistry in Process Research and Development, Pharmaceutical Process Development: Current Chemical and Engineering Challenges, ed. M. T. Williams and J. Blacker, Royal Society of Chemistry, 2011
2. Green Chemistry Theory and Practice, ed. P. T. Anastas and J. C. Warner, Oxford University Press, Oxford, 1998
3. Green chemistry: challenges and opportunities
4. The E Factor: fifteen years on