@article{Van de Pol2009,
author = {Van de Pol, M. and Wright, J.},
title= {A simple method for distinguishing within- versus between-subject effects using mixed models},
year = {2009},
doi = {10.1016/j.anbehav.2008.11.006},
journal = {Animal Behaviour},
volume = {77},
pages = {753--758},
}