| Referências: |
N. W. Ashcroft e N. D. Mermin: "Solid State Physics", HRW Int. Ed., Philadelphia, 1981; D. Craick, "Magnetism Principles and applications", John Wiley and Sons, New York, 1997; K. Yosida, "Theory of Magnetism", Springer, New York, 2006; R. M. White, "Quantum Theory of Magnetism", Springer, new York, 2006. |