1. The reader is referred to the articles on resonance fluorescence in this volume by C. Cohen-Tannoudji and S. Reynaud, p. 93; L. Mandel and H.J. Kimble, p. 95; H. Walther, p. 99; S. Ezekiel, p. 101; B.R. Mollow, p. 103; C.R. Stroud, Jr. and H.R. Gray, p. 115; W.A. McClean and S. Swain, p. 127; and the references contained therein.
2. G.S. Agarwal, Z. Physik 258, 409 (1973).
3. H.J. Carmichael and D.F. Walls, Z. Physik B23, 299 (1976).
4. M.O. Scully and W.E. Lamb, Phys. Rev. 159, 208 (1967).
5. R. Landauer, IBM Research RC 2960 (1970).