EP0101552A2 - Magnetic materials, permanent magnets and methods of making those - Google Patents
Perspective and Prospects for Rare Earth Permanent Magnets
PDF] The Impact of the Selection of Permanent Magnets on the Design of Permanent Magnet Machines – a Case Study: Permanent Magnet Synchronous Machine Design with High Efficiency | Semantic Scholar
Current progress and future challenges in rare-earth-free permanent magnets - ScienceDirect