'PSD reliability of key sub-assemblies' (Energy Engineering, 2017), 'Wave and Tidal Generation Devices: Reliability and availability', Chap. appendixd, pp. 237-240, DOI: 10.1049/PBRN018E_appendixd IET Digital Library, https://digital-library.theiet.org/;jsessionid=b8kmjdetaik9g.x-iet-live-01content/books/10.1049/pbrn018e_appendixd