C. W. Oates, K. R. Vogel, and J. L. Hall, "Improved frequency-domain lifetime measurement of the Na 3p level in a magneto-optic-cell trap,"
in Quantum Electronics and Laser Science Conference, T. Heinz, G. Stegeman, J. Bokor, and R. Slusher, eds.,
Vol. 16 of OSA Technical Digest
(Optical Society of America, 1995), paper QWF1.