Li, Bin; Duan, Zhitian; Wang, Xin; Wu, Jianzhong: 'Loss-of-excitation analysis and protection for pumped-storage machines during starting', IET Renewable Power Generation, 2016, 10, (1), p. 71-78, DOI: 10.1049/iet-rpg.2015.0013
IET Digital Library, https://digital-library.theiet.org/;jsessionid=tl4ptwp06ha6.x-iet-live-01content/journals/10.1049/iet-rpg.2015.0013