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Ingle, James D., 1946-
Englewood Cliffs, N.J. : Prentice Hall, 1988.
Littlejohn, David
Analytica Chimica Acta, 1994, Vol.297 (3), p.466-468
Sturgeon, Ralph
Spectrochimica Acta Part B: Atomic Spectroscopy, 1988, Vol.43 (12), p.1509-1510