NASA - National Aeronautics and Space Administration

Talbot, R., J. D. Bradshaw, S. T. Sandholm, H. B. Singh, G. Sachse, J. Collins, G. L. Gregory, B. E. Anderson, J. Barrick, E. Browell, K. Klemm, B. Lefer, O. Klem, K. Gorzelska, J. Olson, D. Herlth, and D. O'Hara (1993), Summertime distributions and relations of reactive odd-nitrogen species and NOy in the troposphere over Canada, J. Geophys. Res..