S.A. Archer, A.J. Murray, J.B. Omajali, M. Paterson-Beedle, B.K. Sharma, J. Wood and L.E. Macaskie. (2019) Chapter 13 in Resource Recovery from Wastes: Towards a Circular Economy, ed. L.E Macaskie, D. Sapsford and W.M. Hayes. Royal Society of Chemistry, London.