'Frequency dependent network equivalents' (Energy Engineering, 2003), 'Power Systems Electromagnetic Transients Simulation', Chap. 10, pp. 251-276, DOI: 10.1049/PBPO039E_ch10
IET Digital Library, https://digital-library.theiet.org/;jsessionid=8rp38pi0fgg3a.x-iet-live-01content/books/10.1049/pbpo039e_ch10