1. See, for example, W. Gerlach and O. Stern, Zeitschrift für Physik
8, 110 (1921), and 9, 349 (1922). Later papers by the same authors are Annalen der Physik
74, 673 (1924) and 76, 163 (1925).
2. N. F. Ramsey, Molecular Beams,the Clarendon Press, Oxford (1956), pp. 398, 399.
3. S. Millman, I. I. Rabi, and J. R. Zacharias Physical Review 53, 384 (1938).
4. D. S. Edmonds, Jr. and M. R. Corson, American Journal of Physics
54(9) 811 (1986).
5. Taken from Ramsey, op. cit.,who adapted it from J. M. B. Kellogg and S. Millman, Rev. Mod. Phys. 18 323 (1946).