BibTex format
@article{Ma:2021:1748-9326/ac30c1,
author = {Ma, L and Graham, D and Stettler, M},
doi = {1748-9326/ac30c1},
journal = {Environmental Research Letters},
pages = {1--16},
title = {Has the Ultra Low Emission Zone in London improved air quality?},
url = {http://dx.doi.org/10.1088/1748-9326/ac30c1},
volume = {16},
year = {2021}
}