Fraser, Alan G.; Beladan, Carmen C.; Popescu, Bogdan A.: 'Assessment of systolic and diastolic heart failure' (Healthcare Technologies, 2018), 'Handbook of Speckle Filtering and Tracking in Cardiovascular Ultrasound Imaging and Video', Chap. 27, pp. 599-619, DOI: 10.1049/PBHE013E_ch27 IET Digital Library, https://digital-library.theiet.org/;jsessionid=51d7vscks8346.x-iet-live-01content/books/10.1049/pbhe013e_ch27