1. Geudens P.J.J.G (2010). "Dutch drinking water statistics 2008 the water cycle from source to tap".
2. Vewin No 2009/95/6259. Vewin Rijswijk.
3. Boersma A. and J. Breen (2005). "Long term performance prediction of existing PVC water distribution
4. systems". TNO Delft TNO MT-RAP-05-11648/idl.
5. Breen J. (2006). "Expected lifetime of existing PVC water distribution systems". TNO Delft TNO MT