'Smart Grid versus conventional electrical networks' (Energy Engineering, 2017), 'Introduction to the Smart Grid: Concepts, Technologies and Evolution', Chap. 2, pp. 25-43, DOI: 10.1049/PBPO094E_ch2
IET Digital Library, https://digital-library.theiet.org/;jsessionid=7ogodq8k2n6eu.x-iet-live-01content/books/10.1049/pbpo094e_ch2