Auroral N₂ emissions and the effect of collisional processes on N₂ triplet state vibrational populations
Jeff S. Morrill, William M. Benesch, Vol.101, No. A1, Pages 261-274, Jan. 1996

In Search for Ultrahigh-Energy Gamma Rays from Egret-Detected Active Galactic Nuclei Using CASA-MIA
Catanese, M. et al.1996, Ap.J., 469,572.