BibTex format
@article{Donaldson:2013:10.4104/pcrj.2013.00078,
author = {Donaldson, GC and Wedzicha, JA},
doi = {10.4104/pcrj.2013.00078},
journal = {Primary Care Respiratory Journal},
pages = {264--265},
title = {Deprivation, winter season, and COPD exacerbations},
url = {http://dx.doi.org/10.4104/pcrj.2013.00078},
volume = {22},
year = {2013}
}