1. I.I. Rabi, J. R. Zacharias, S. Millman, and P. Kush, Phys. Rev.
53, 318 (1938).
2. K. F. Smith, Molecular Beams, Methuen, London (1955).
3. N. F. Ramsey, Molecular Beams, Oxford University Press, London (1956).
4. H. Kopfermann, Nuclear Moments, trans. E. E. Schneider, Academic Press, New York (1958).
5. P. Kusch and V. W. Hughes, “Atomic and Molecular Beam Spectroscopy,” in Handbuch der Physik, ed. S. Flügge, Vol. 37/1, pp. 1–172, Springer-Verlag, Berlin (1959).