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2. Differential Forms in Electromagnetics
3. Lindell, I. V. and Wallén, K. H. November 2003. Differential-form electromagnetics and bi-anisotropic Q-media November, 416 Helsinki Univ. Tech. Electromagnetics Lab. Rept.
4. Lindell, I. V. and Wallén, K. H. December 2003. “Generalized Q-media and field decomposition in differential-form approach”. December, 421 Helsinki Univ. Tech. Electromagn. Lab. Rept.