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Kallen, R.G.; Viale, R.O.; Smith, L.K., Methylene Derivatives of Nitrogen, Oxygen, and Sulfur. Cationic N,N'-Methylenediamine FOrmation and Thelrmodynamic Parameters for Equilibria for the Reaction of Morpholine with Formaldehyde and Proto, J. Am. Chem. Soc., 1972, 94, 576. [all data]