Gierull, Christoph H.: 'Introduction to imaging radar' (Radar, Sonar and Navigation, 2017), 'Novel Radar Techniques and Applications Volume 1: Real Aperture Array Radar, Imaging Radar, and Passive and Multistatic Radar', Chap. ptII, pp. 173-181, DOI: 10.1049/SBRA512F_ptII IET Digital Library, https://digital-library.theiet.org/;jsessionid=32n31mqhceq5u.x-iet-live-01content/books/10.1049/sbra512f_ptii