Zhang, Mingkang; Liang, Deliang; Liu, Yibin; Liang, Yang: 'Design of the fuzzy PI control system for load voltage in hybrid distribution transformer', The Journal of Engineering, 2019, 2019, (16), p. 1798-1801, DOI: 10.1049/joe.2018.8745 IET Digital Library, https://digital-library.theiet.org/;jsessionid=5bih3t0ufubha.x-iet-live-01content/journals/10.1049/joe.2018.8745