Fairthorne, RA (1969). Progress in Documentation - Empirical Hyperbolic Distributions (Bradford-Zipf-Mandelbrot) for Bibliometric Description and Prediction. Journal of Documentation 25(4), pp. 319-343; reprinted 2005 in Journal of Documentation 61(2), pp. 171-193.
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Rousseau, R (2005). Robert Fairthorne and the empirical power laws. Journal of Documentation 61(2), pp. 194-202. DOI:10.1108/00220410510585188.