Koike, M., Y. Kondo, S. Kawakami, H. Nakajima, G. Gregory, G. Sachse, H. Singh, E. Browell, J. Merrill, and R. Newel (1997), Reactive nitrogen and correlation with O3 and CO over the Pacific in winter and early spring., J. Geophys. Res., 102, 28,385-28.