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(75.3): L.J. Radziemski Jr. and J. Blaise, 1975, 7th Conf. Europ. Group Atomic Spectrosc., Grenoble, Fr, 1975, n° 593.

(82.3): H.M. Crosswhite, Gmelin Handbook of inorganic chemistry, 8th edition, Uranium Suppl., 1982, 1-68, Springer-Verlag.

(84.1): J.G. Conway, E.F. Worden, J.W. Brault, R.P. Hubbard and J.R. Wagner, At. Data Nucl. Data Tables, U.S.A., 1984, 31, 299-358.

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(unp.18): R. Engleman Jr.

(unp.22): D.D. Laun.