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- A good discussion of the classical theory and modern developments is found in Dirk Schwalm (2007). “The relativistic Doppler effect and time dilation”, Ewald Hiebl and Maurizio Musso, eds: Christian Doppler: life and work, principle and applications : proceedings of the Commemorative Symposia in 2003, Salzburg, Prague, Vienna, Venice. Living Edition, pp. 77 ff. ISBN 3901585095.