1. R. A. Fairthorne, Empirical hyperbolic distributions (Bradford-Zipf-Mandelbrot) for bibliometric description and prediction,Journal of Documentation, 25 (1969), No. 4. Repr. in:T. Saracevic (Ed.),Introduction to Information Science, R. R. Bowker, New York, 1970, 521–534.
2. J. R. Cole, S. Cole, The Ortega hypothesis,Science, 178 (1972) 368–375.
3. R. K. Merton, Changing foci of interests in the sciences and technology. In:The Sociology of Science,R. K. Merton,N. W. Storer (Ed.), University of Chicago Press, Chicago, 1973, 191–203.
4. D. J. de Solla Price,Little Science, Big Science, Columbia University Press, New York, 1963.
5. N. Rescher,Scientific Progress. A Philosophical Essay on the Economics of Research in Natural Science, Blackwell, Oxford, 1978.