BibTex format
@article{Castres:2017:10.1136/bmj.j2855,
author = {Castres, P and Dajnak, D and Lott, M and Watts, N},
doi = {10.1136/bmj.j2855},
journal = {BMJ},
pages = {1--2},
title = {Most London hospitals and clinics exceed air pollution limits},
url = {http://dx.doi.org/10.1136/bmj.j2855},
volume = {357},
year = {2017}
}