Miller, J.M.: 'Developments in NDT techniques for use in the offshore industry', IET Conference Proceedings, 1999, p. 4-4, DOI: 10.1049/ic:19990723
IET Digital Library, https://digital-library.theiet.org/;jsessionid=54fh2rnmrjbsr.x-iet-live-01content/conferences/10.1049/ic_19990723