Before revision: As of 2001 the Kroll process replaced the Hunter process for almost all commercial production.Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. .
After revision: As of 2001 William Justin Kroll's process replaced the Hunter process for almost all commercial production.Holleman, A. F.; Wiberg, E. "Inorganic Chemistry" Academic Press: San Diego, 2001. .