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Gerber, G., & Möller, R. (1985). Optical-optical double-resonance spectroscopy of high vibrational levels of the Na2 A 1Σu+ state in a molecular beam. Chemical Physics Letters, 113(6), 546–553. doi:10.1016/0009-2614(85)85029-6 
10.1016/0009-2614(85)85029-6