BibTex format
@article{Parau:2017:10.1007/s10336-017-1468-1,
author = {Parau, LG and Kingma, SA and Weigl, SE and Dugdale, HL and Lessells, CM and Schroeder, J},
doi = {10.1007/s10336-017-1468-1},
journal = {Journal of Ornithology},
pages = {1119--1122},
title = {Dynamics in numbers of group-roosting individuals in relation to pair-sleeping occurrence and onset of egg-laying in European Bee-eaters Merops apiaster},
url = {http://dx.doi.org/10.1007/s10336-017-1468-1},
volume = {158},
year = {2017}
}