Singh, H.,
D. Herlth, D. O’Hara, L. Salas, A. L. Torres, G. L. Gregory,
G. Sachse, and J. F. Kasting (1990), Atmospheric PAN Measurements over the Brazilian Amazon Basin during the West Season: Relationships with Nitrogen Oxides and Ozone,
J. Geophys. Res., 95, 16,945-16.