1. OFWAT. Setting price controls for 2015-20 Final price control determination notice: company-specific appendix – Dŵr Cymru. OFWAT Final determinations. [Online] [Cited: May 28, 2015.] https://www.ofwat.gov.uk/pricereview/pr14/det_pr20141212wsh.pdf.
2. Hall, M., et al. Deterioration Rate of Sewers. UKWIR. s.l. : UK Water Industry Research Limited2005/6.
3. Savic, Dragan A. The use of data-driven methodologies for prediction of water and wastewater asset failures. Risk Management of Water Supply and Sanitation Systems. s.l. : Springer Netherlands, pp. 181-190.
4. A new approach for directing proactive sewer maintenance. Fenner, R.A., Sweeting, L., Marriott, M.J. 2000. Proceedings of the ICE-Water and Maritime Engineering. Vol. 142 (2)pp. 67-77.
5. Investigation of blockage relationships and the cost implications for sewerage network management. W Shepherd, A Cashman, S Djordjevic, G Dorini, A Saul, D Savic, L Lewis. Copenhagen, Denmark : s.n.2005. Proceedings of 10th International Conference on Urban Drainage. pp. 21-26.