'Introduction to Stealth Systems' (Radar, Sonar and Navigation, 2004), 'Introduction to RF Stealth', Chap. 1, pp. 1-59, DOI: 10.1049/SBRA120E_ch1
IET Digital Library, https://digital-library.theiet.org/;jsessionid=geurwc6h184t.x-iet-live-01content/books/10.1049/sbra120e_ch1