(67.2): R.G. Gutmacher, J.E. Evans and E.K. Hulet, J. opt. Soc. Am., 1967, 57, 1389-90.

(70.5): E.F. Worden, R.G. Gutmacher, R.W. Loughed, J.G. Conway and R.J. Mehlhorn, J. opt. Soc. Am., 1970, 60, 1297-302.

(74.5): E.F. Worden, R.W. Loughed, R.G. Gutmacher and J.G. Conway, J. opt. Soc. Am., 1974, 69, 7785.

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

(unp.9): J. Blaise and J.F. Wyart.

(unp.17): H. Crosswhite and H.M. Crosswhite.