'Overview of wave and tidal development' (Energy Engineering, 2017), 'Wave and Tidal Generation Devices: Reliability and availability', Chap. 1, pp. 1-32, DOI: 10.1049/PBRN018E_ch1 IET Digital Library, https://digital-library.theiet.org/;jsessionid=8rfaio51g0rdk.x-iet-live-01content/books/10.1049/pbrn018e_ch1