1. C D Manning and H Schütze, Foundations of statistical natural language processing (MIT Press, UK, 1999)
2. R Harald Baayen, Word frequency distributions (Springer Science & Business Media, 2001), Vol. 18
3. G K Zipf, The psycho-biology of language (George Routledge & Sons, Ltd., 1936), reprinted in 2002
4. W Li, IEEE Trans. Inf. Theory
38(6), 1842 (1992)
5. B Mandelbrot, Information theory and psycholinguistics (BB Wolman and E, USA, 1965)