1. T J Dolan
Electron and ion collisions with water vapour
1993 J. Phys. D: Appl. Phys. 26 4-8
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http://dx.doi.org/10.1088/0022-3727/26/1/002Demonstration of XUV amplification to the ground state in low-charged nitrogen ions
Optics Communications
Volume 170, Issues 1-3, 15 October 1999, Pages 71-78
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http://dx.doi.org/10.1016/S0030-4018(99)00432-0