Balleri, Alessio; Griffiths, Hugh; Baker, Chris: 'Introduction' (Radar, Sonar and Navigation, 2017), 'Biologically-Inspired Radar and Sonar: Lessons from nature', Chap. 1, pp. 1-3, DOI: 10.1049/SBRA514E_ch1
IET Digital Library, https://digital-library.theiet.org/;jsessionid=eak8c3cm3gp0g.x-iet-live-01content/books/10.1049/sbra514e_ch1