@article{Schwartz_2015,
	doi = {10.1002/2014jd021964},
	url = {https://doi.org/10.1002%2F2014jd021964},
	year = 2015,
	month = {jan},
	publisher = {American Geophysical Union ({AGU})},
	volume = {120},
	number = {2},
	pages = {843--867},
	author = {M. J. Schwartz and G. L. Manney and M. I. Hegglin and N. J. Livesey and M. L. Santee and W. H. Daffer},
	title = {Climatology and variability of trace gases in extratropical double-tropopause regions from {MLS}, {HIRDLS}, and {ACE}-{FTS} measurements},
	journal = {Journal of Geophysical Research: Atmospheres}
}