Janjic, Jovana; van Soest, Gijs: 'Speckle physics' (Healthcare Technologies, 2018), 'Handbook of Speckle Filtering and Tracking in Cardiovascular Ultrasound Imaging and Video', Chap. 2, pp. 25-54, DOI: 10.1049/PBHE013E_ch2
IET Digital Library, https://digital-library.theiet.org/;jsessionid=1rjkw4qmoasib.x-iet-live-01content/books/10.1049/pbhe013e_ch2