References
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- Jackson , J. D. 1975 . Classical Electrodynamics , 2nd ed , New York : Wiley . Sec. 1.7
- Feynman , R. P. , Leighton , R. B. and Sands , M. 1964 . The Feynman Lectures on Physics , Vol. II , Reading : Addison-Wesley . Sec. 5–8