Brahma, Sukumar: 'Synchrophasor-assisted visualization and protection of power systems' (Energy Engineering, 2017), 'Synchronized Phasor Measurements for Smart Grids', Chap. 4, pp. 99-122, DOI: 10.1049/PBPO097E_ch4
IET Digital Library, https://digital-library.theiet.org/;jsessionid=9ngc13aeltd25.x-iet-live-01content/books/10.1049/pbpo097e_ch4