Directions in quantum optics : a collection of papers dedicated to the memory of Dan Walls including papers presented at the TAMU-ONR workshop held at Jackson, Wyoming, USA, 26-30 July 1999 / editors H.J. Carmichael, R.J. Glauber, M.O. Scully.    Berlin ; Heidelberg ; New York :  Springer-Verlag,  c2001 . xvi, 369 s.