Asefi, Mahdi; Nazarzadeh, Jalal: 'Survey on high-frequency models of PWM electric drives for shaft voltage and bearing current analysis', IET Electrical Systems in Transportation, 2017, 7, (3), p. 179-189, DOI: 10.1049/iet-est.2016.0051 IET Digital Library, https://digital-library.theiet.org/;jsessionid=2h8swugc24hk8.x-iet-live-01content/journals/10.1049/iet-est.2016.0051