1. Austin, Shreve’s Chemical Process Industries, pp. 213–215, 231–239.
2. Chemical Profiles in Chemical Marketing Reporter, 5-25-98, 6-1-98, 11-22-99, 5-1-00, 5-22-00, and 5-29-00
3. Kent, Riegel’s Handbook of Industrial Chemistry, pp. 408–409, 421–436.