1. The fine-structure constant, magnetic monopoles and dirac charge quantization condition
2. Magnetic Monopoles
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4. L. D. Landau , L. P.Pitaevskii and E. M.Lifshitz, Electrodynamics of Continuous Media, Butterworth-Heinemann, Oxford, second edn, 1984
5. W. Cai and V.Shalaev, Optical Metamaterials: Fundamentals and Applications, Springer, 2009