BibTex format
@article{Nicolaou:2011:10.1177/155005941104200107,
author = {Nicolaou, N and Georgiou, J},
doi = {10.1177/155005941104200107},
journal = {CLINICAL EEG AND NEUROSCIENCE},
pages = {24--28},
title = {The Use of Permutation Entropy to Characterize Sleep Electroencephalograms},
url = {http://dx.doi.org/10.1177/155005941104200107},
volume = {42},
year = {2011}
}