1. Carmeli, M.: 1982,Classical Fields, J. Wiley and Sons, New York.
2. De Groot, S. R. and Suttorp, L. G.: 1972,Foundations of Electrodynamics, North-Holland, Amsterdam.
3. Eddington, A. S.: 1946,Fundamental Theory, Cambridge University Press, Cambridge.
4. Imbert, C.: 1972,Phys. Rev. D5, 787.
5. Kobayashi, S. and Nomizu, K.: 1963,Foundations of Differential Geometry, Vol. 1, Interscience, New York.