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3. G.C. Carter, A.R. Doumaux, S.W. Kaiser, P.R. Umberger, in: Kisk-othemer (Ed.), Encyclopedia in Chemical Technology, 4th Edition, Vol. 8, Wiley, New York, 1992, p. 74.
4. Reaction of N-(2-hydroxyethyl) ethylenediamine over zeolite and chromite catalysts