Reference Label	Details
de Nijs 2011	A. J. de Nijs, E. J. Salumbides, K. S. E. Eikema, W. Ubachs, and H. L. Bethlem, Phys. Rev. A 84, 052509/1-12 (2011) UV-Frequency Metrology on CO (a 3Pi): Isotope Effects and Sensitivity to a Variation of the Proton-to-Electron Mass Ratio