Samantaray, S. R.; Kamwa, Innocent; Joos, Geza: 'PMU-based wide-area security assessment' (Energy Engineering, 2017), 'Synchronized Phasor Measurements for Smart Grids', Chap. 11, pp. 305-331, DOI: 10.1049/PBPO097E_ch11 IET Digital Library, https://digital-library.theiet.org/;jsessionid=3fhca7sgov1p4.x-iet-live-01content/books/10.1049/pbpo097e_ch11