Norman, Liam; Thaler, Lore: 'Human echolocation - spatial resolution and signal properties' (Radar, Sonar and Navigation, 2017), 'Biologically-Inspired Radar and Sonar: Lessons from nature', Chap. 10, pp. 209-227, DOI: 10.1049/SBRA514E_ch10 IET Digital Library, https://digital-library.theiet.org/;jsessionid=4kmd7g9b9tdq5.x-iet-live-01content/books/10.1049/sbra514e_ch10