@article{Nassar_2007, title={Variability in HDO/H2O abundance ratios in the tropical tropopause layer}, volume={112}, ISSN={0148-0227}, url={http://dx.doi.org/10.1029/2007JD008417}, DOI={10.1029/2007jd008417}, number={D21}, journal={Journal of Geophysical Research: Atmospheres}, publisher={American Geophysical Union (AGU)}, author={Nassar, Ray and Bernath, Peter F. and Boone, Chris D. and Gettelman, Andrew and McLeod, Sean D. and Rinsland, Curtis P.}, year={2007}, month=nov }