Reference Label	Details
note unc	The quoted uncertainty appeared to correspond to one std dev. and was multiplied by 2 to come closer to the desired 95% confidence limit
Eikema 1997	K. S. E. Eikema, W. Ubachs, W. Vassen, and H. Horgorvorst. Phys. Rev. A 55, 1866-1884 (1997) Lamb Shift Measurement in the 1 1S Ground State of Helium