1. Ask-Upmark , E. Personal communication 1965
2. Ulcerations of the nasal membranes and perforation of the septum in a copperplanting factory;Barsky;N. Y. St. J. Med.,1937
3. Chronic poisoning by cyanides and hydrocyanic acid;Chaumont;Arch. Mal. prof.,1960
4. Disease of primary motor neurons, causing the clinical picture of acute anterior poliomyelitis; the result of poisoning by cyanide of potassium;Collins;J. nerv. merit. Dis.,1908