BibTex format
@article{To:2011:10.1378/chest.10-1608,
author = {To, M and Ausin, PM and Kharitonov, SA and Barnes, PJ},
doi = {10.1378/chest.10-1608},
journal = {CHEST},
pages = {76--83},
title = {Osteoprotegerin in Sputum Is a Potential Biomarker in COPD},
url = {http://dx.doi.org/10.1378/chest.10-1608},
volume = {140},
year = {2011}
}