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W.A. Ross, G.A. Jensen, L.L. Clark, D.E. Eakin, J.H. Jarrett, Y.B. Katayama, R.W. McKee, L.G. Morgan, S.M. Nealey, A.M. Platt, G.L. Tingey. "Projection of needs for gamma radiation sources and other radioisotopes and assessment of alternatives for providing radiation sources." (1989)