Balleri, Alessio; Griffiths, Hugh; Baker, Chris; Holderied, Marc: 'Analysis of acoustic echoes from bat-pollinated plants' (Radar, Sonar and Navigation, 2017), 'Biologically-Inspired Radar and Sonar: Lessons from nature', Chap. 5, pp. 89-107, DOI: 10.1049/SBRA514E_ch5
IET Digital Library, https://digital-library.theiet.org/;jsessionid=2n2b0dn0276ni.x-iet-live-01content/books/10.1049/sbra514e_ch5