Zheng, J. A., Weinheimer, A. J., Ridley, B. A., Liu, S. C., Sachse, G. W., Anderson, B. E., & Collins, J. E. (1996). Analysis of small- and large-scale increases of reactive nitrogen observed during the Second Airborne Arctic Stratospheric Expedition. Journal Of Geophysical Research-Atmospheres, 101, 28805-28816. doi:10.1029/96JD02034