Alvaro E. Hoffer Ilya Petrov Juha J. Pyrhönen Juan A. Tapia Stainless-Core Submersible Permanent Magnet Synchronous Machine. 28089-28100 2021 9 IEEE Access https://doi.org/10.1109/ACCESS.2021.3058593 db/journals/access/access9.html#HofferPPT21