Reference:

Jefrey Lijffijt, Panagiotis Papapetrou, Kai Puolamäki, and Heikki Mannila. Analyzing word frequencies in large text corpora using inter-arrival times and bootstrapping. In Proceedings of ECML-PKDD 2011, pages 341–357, 2011.

Suggested BibTeX entry:

@inproceedings{lijffijt11pkdd,
    author = {Jefrey Lijffijt and Panagiotis Papapetrou and Kai Puolam\"aki and Heikki Mannila},
    booktitle = {Proceedings of ECML-PKDD 2011},
    language = {eng},
    pages = {341--357},
    title = {Analyzing Word Frequencies in Large Text Corpora using Inter-arrival Times and Bootstrapping},
    year = {2011},
}