Ward, Keith D.; Tough, Robert J.A.; Watts, Simon: 'Sea Clutter: Scattering, the K Distribution and Radar Performance' (Radar, Sonar and Navigation, 2006) DOI: 
IET Digital Library, https://digital-library.theiet.org/;jsessionid=7nog96ka809k.x-iet-live-01content/books/ra/pbra020e