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E. Buys, “Electriciteit of Brandsteenkracht,” Nieuw en Volkomen Woordenboek van Konsten en Weeten schappen: Bevattende alle de Takken der Nuttige Kennis, p.529, Derde Delle Amsterdam, S F Baalde Boekverkooper, 1771.
M. Faraday, Experimental Researches in Electricity, vol.2, Eighteen series §25, pp.106-125, Richard and John Edward Taylor, London, 1844.
J.C. Maxwell, A Treatise on Electricity & Magnetism, 3rd Edition, vol.1, pp.32-34, Dover, New York, 1954.