BibTex format
@article{Kessler:2011:10.1183/09031936.00051110,
author = {Kessler, R and Partridge, MR and Miravitlles, M and Cazzola, M and Vogelmeier, C and Leynaud, D and Ostinelli, J},
doi = {10.1183/09031936.00051110},
journal = {EUROPEAN RESPIRATORY JOURNAL},
pages = {264--272},
title = {Symptom variability in patients with severe COPD: a pan-European cross-sectional study},
url = {http://dx.doi.org/10.1183/09031936.00051110},
volume = {37},
year = {2011}
}