Aller M.F., A.P. Marscher, R.C. Hartman, H.D. Aller, M.C. Aller, T.J. Balonek, M.C. Begelman, M. Chiaberge, S.D. Clements, W. Collmar, and G. De Francesco, in Unknown (AIP, Williamsburg, Virginia (Usa), 1997), pp. 1423-1427.
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