Smyth, S., S. Sandholm, J. Bradshaw, S. Mckeen, R. Talbot, D. R. Blake, N. J. Blake, S. Rowland, H. Singh, G. Gregory, B. E. Anderson, G. Sachse, J. Collins, and S. Bachmeier (1996), Factors influencing the upper free tropospheric distribution of reactive nitrogen over the south Atlantic during the TRACE experiment, J. Geophys. Res., 101.D19, 24,165-24.