1. L.D. Landau, E.M. Lifshitz, Theory of Elasticity (Butterworth-Heineman, 2005)
2. H. Jeffreys, B.S. Jeffreys, Methods of Mathematical Physics (Chap. 3). Cambridge University Press
3. J.D. Jackson, Classical Electrodynamics, 2nd edn. Wiley Eastern Ltd
4. E. Fermi, Z. f. Phy. 88, 161 (1934)
5. S. Gasiorowicz, Elementary Particle Physics. John Wiley and Sons