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2. 70 years of experience with PVC pipes;Hülsmann,2004
3. Position Paper - 100 Years Lifetime of Polyethylene Pressure Pipe Systems Buried in the Ground for Water and Natural Gas Supply;Teppfa & Pe100+,2019
4. The experience with the use of UPVC pipes in various buried applications;Alferink,2016
5. Validation of the long life of PVC pipes;Folkman,2014