1. Pigging of subsea pipelines;Schaefer,1991
2. Non-destructive testing. Part 1. Radiographic testing;Mcnamee;Engineers Digest,1970
3. Rov intervention for the location of plugs and leaks in deep water production flowlines;Van,2000
4. Pipeline blockage location by strain measurement using an ROV;Rogers,1995
5. L.D. Hiebert, Non-intrusive locating of a blockage in a pipeline, USA, 6,725,717, 2004.