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2. K. Gottfried, V.F. Weisskopf, Concepts of Particle Physics (Oxford University Press, Oxford, 1984)
3. J. Baggott, Farewell to Reality (Pegasus Books, New York, 2013)
4. M. Sachs, Concepts of Modern Physics (Imperial College Press, London, 2007)
5. N. Tesla, New York Herald Tribune, Sept. 11, 1932.