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2 | J. R. Holmann, Andre-Marie Ampere, Blackwell,1995 |
3 | Edmund Whittaker, History of the Theory of Aether and Electricity, The Classical Theories, vol. 1, pp. 85-88, 1987 |
4 | M. Mason, W. Weaver, The EIectromagnetic Fietd,New York, Dover Publication, Inc., pp. 176-185, 1929 |