Shi, Yuxin; Wang, Zezhong: 'Calculating for surface electric field of converter valve shield system with fast multipole curved boundary element method', The Journal of Engineering, 2019, 2019, (16), p. 1575-1579, DOI: 10.1049/joe.2018.8647
IET Digital Library, https://digital-library.theiet.org/;jsessionid=2oe2hel1p0upi.x-iet-live-01content/journals/10.1049/joe.2018.8647