Blacknell, David; Griffiths, Hugh (ed.): 'Radar Automatic Target Recognition (ATR) and Non-Cooperative Target Recognition (NCTR)' (Radar, Sonar and Navigation, 2013) DOI: 
IET Digital Library, https://digital-library.theiet.org/;jsessionid=70e81ssb44odd.x-iet-live-01content/books/ra/pbra033e