1. Facets of Physics, V.W. Hughes and D. A. Bromley, Eds., (Academic Press, N.Y., 1970 ) as told by Gregory Breit on the occasion of his retirement at Yale University. Breit goes on to say, “The meaning of Einstein’s remark is also especially appropriate in the present period, which shows the effects of pushing, elbowing and self-advertising that physicists learned during the war years.” Needless to say, Breit’s statement has some relevance to the current situation in physics
2. T.W. Hänsch, I.S. Shahin, and A.L. Schawlow, Nature 235, 63 (1972)
3. M.G. Boshier et al., Nature 330, 463 (1987) and talk by D.N. Stacey
4. S. Triebwasser, E.S. Dayhoff and W.E. Lamb, Phys. Rev. 89, 98 (1953)
5. See talks by F. Pipkin and Yu. L. Sokolov in this book. See also G. W. F. Drake, J. Patel and A. van Wijngaarden, Phys. Rev. Lett. 60, 1002 (1988) for He+