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@article{Hailman1985,
title = {The 'chick-a-dee' calls of em Parus em atricapillus: a recombinant system of animal communication compared with written English},
author = {J P Hailman and M S Ficken and R W Ficken},
doi = {10.1515/semi.1985.56.3-4.191},
year = {1985},
date = {1985-01-01},
journal = {Semiotica},
volume = {56},
pages = {121-224},
keywords = {Zipf's law of abbreviation},
pubstate = {published},
tppubtype = {article}
}

@article{FICKEN1978630,
title = {A model of repetitive behaviour illustrated by chickadee calling},
author = {Millicent S Ficken and Jack P Hailman and Robert W Ficken},
url = {http://www.sciencedirect.com/science/article/pii/0003347278900751},
doi = {10.1016/0003-3472(78)90075-1},
issn = {0003-3472},
year = {1978},
date = {1978-01-01},
journal = {Animal Behaviour},
volume = {26},
pages = {630 - 631},
abstract = {If the probability of an animal's continuing (or repeating) a given behavioral pattern is independent of the elapsed time (or number of previous acts), the data conform to the exponential distribution generated by a Poisson process. The number of chickadee calls/bout was recorded for 1,524 bouts. Results show a negative linear relation between the number of calls/bout and the cumulative frequency of bouts when plotted on logarithmic axes.},
keywords = {Zipf's law of abbreviation},
pubstate = {published},
tppubtype = {article}
}