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Schappe, R.S.; Schulman, M.B.; Sharpton, F.A.; Lin, C.C., Emission of the O2+ (A2«PI»u --> X2«PI»g) second-negative-band system produced by electron impact on O2, Phys. Rev. A: Gen. Phys., 1988, 38, 4537-4545. [all data]