Balci, Murat Erhan; Hocaoglu, Mehmet Hakan: 'Frequency-domain power theory and metering of harmonic-pollution responsibility' (Energy Engineering, 2017), 'Power Quality in Future Electrical Power Systems', Chap. 2, pp. 29-75, DOI: 10.1049/PBPO092E_ch2
IET Digital Library, https://digital-library.theiet.org/;jsessionid=gkbh8n8t0a8sl.x-iet-live-01content/books/10.1049/pbpo092e_ch2