Reference Label	Details
note std dev	Originally one std. dev. was given and was multiplied by 2 (for large or unknown number of measurements) or the appropriate Student-t factor (for a smaller number of determinations) to come closer to the desired 95% confidence limit.
Johnson 1985	W. R. Johnson and G. Soff, At. Data Nucl. Data Tables 33, 405-446 (1985) The Lamb Shift in Hydrogen-Like Atoms, 1 <= Z <= 110