Weinstock, E. M., Pittman, J. V., Sayres, D. S., Smith, J. B., Anderson, J. G., Wofsy, S. C., Xueref, I., Gerbig, C., Daube,
B. C., Pfister, L., Richard, E. C., Ridley, B. A., Weinheimer, A. J., Jost, H. J., Lopez, J. P., Loewenstein, M., & Thompson,
T. L. (2007). Quantifying the impact of the North American monsoon and deep midlatitude
convection on the subtropical lowermost stratosphere using in situ measurements. Journal of Geophysical
Research - Atmospheres, 112(18), D18310. doi:10.1029/2007JD008554.