1. A.B. van Geysel, W. Musin, in: B. Elvers, S. Hawkins, G. Schultz (Eds.), Ullmann’s Encyclopedia of Industrial Chemistry, 5th ed., vol. A16, VCH, Weinheim, p. 535.
2. G. Heilen, H.J. Mercker, D. Frank, R.A. Reck, R. Jäckh, in: W. Gerhertz (Ed.), Ullmann’s Encyclopedia of Industrial Chemistry, 5th ed., vol. A2, VCH, Weinheim, 1985, p. 1.
3. M.G. Turcotte, T.A. Johnson, in: J.J. Kroschwitz (Ed.), Kirk Othmer Encyclopedia of Chemical Technology, 4th ed., vol. 2, Wiley, New York, 1992, p. 369.
4. L.D. Pesce, W.R. Jenks, in: J.A. Kent (Ed.), Riegel’s Handbook of Industrial Chemistry, 9th ed., Van Nostrand Reinhold, New York, 1992, p. 1109.
5. Methylamines synthesis: A review