Guan, Yang, Zhu, Z. Q., Azar, Ziad, Thomas, Arwyn S., Vedreño-Santos, Francisco, Li, Guang-Jin, Odavic, Milijana, "Comparison of Electromagnetic Performance of 10-MW Superconducting Generators With Different Topologies for Offshore Direct-Drive Wind Turbines", IEEE Transactions on Applied Superconductivity, 2017