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(59.8): L. Bovey and E.B.M. Steers, 1959, A.E.R.E. Report- R3118.

(59.9): J. Haaland, 1959, K.R. Report-1.

(63.3): M. Fred and F.S. Tomkins, J. opt. Soc. Am., 1963, 53, 506.

(76.14): M. Fred, F.S. Tomkins, J.E. Blaise, P. Camus and J. Vergès, 1976, A.N.L. Report-76-68.

(77.2): M. Fred, F.S. Tomkins, J.E. Blaise, P. Camus and J. Vergès, J. opt. Soc. Am., 1977, 67, 7-23.

(77.7): J. Blaise, P. Luc and J. Vergès, 9th Conf. Europ. Group Atomic Spectrosc., Cracow, Poland, 1977, 20.

(79.2): E.F. Worden, J.G. Conway, J. opt. Soc. Am., 1979, 69, 733-8.

(80.4): J. Blaise, J.F. Wyart, J.G. Conway and E.F. Worden, Physica Scripta, Sweden, 1980, 22, 224-30.

(unp.2): J. Blaise.

(unp.19): M. Fred and H. Crosswhite.

(unp.32): J.F. Wyart.