Simmons, James A.; Gaudette, Jason E.; Warnecke, Michaela: 'Biosonar-inspired signal processing and acoustic imaging from echolocating bats' (Radar, Sonar and Navigation, 2017), 'Biologically-Inspired Radar and Sonar: Lessons from nature', Chap. 2, pp. 5-36, DOI: 10.1049/SBRA514E_ch2
IET Digital Library, https://digital-library.theiet.org/;jsessionid=2x6t5io117b8o.x-iet-live-01content/books/10.1049/sbra514e_ch2