1. Selective Studies and the Principle of Relative Frequency in Language;Zipf,1932
2. The Psycho-biology of Language: An Introduction to Dynamic Philology;Zipf,1935
3. Human Behavior and the Principle of Least Effort;Zipf,1949
4. A brief history of generative models for power law and lognormal distributions;Mitzenmacher;Internet Math.,2003
5. Word Frequency Distributions;Baayen,2001