1. Effects of eddy currents in transformer winding;Dowell;Proceedings of the IEE,1966
2. J. Jongsma “High-frequency ferrite power transformer and choke design, Part 3: Transformer winding design, Part 4: Improved method of power choke design” 1986
3. Experimental research on skin effect in conductors;Kennelly;Transactions AIEE,1915