Folkins, I. A., Weinheimer, A. J., Ridley, B. A., Walega, J. G., Anderson, B., Collins, J. E., … Blake, D. R. (1995). O₃, NOy, and NOx/NOy in the upper troposphere of the equatorial Pacific. Journal Of Geophysical Research-Atmospheres, 100, 20913-20926. doi:10.1029/95JD01637