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Solla Price, D. de: Little science, big science (1963)
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Garfield, E.; Sher, I.H.: New factors in the evaluation of scientific literature literature through citation indexing (1963)
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Brookes, B.C.: Bradford' law and the bibliography of science (1969)
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Fairthorne, R.A.: Empirical hyperbolic distributions (Bradford-Zipf-Mandelbrot) for bibliometric description and prediction (1969)
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