Disorders of the Nervous System Caused by Drugs, Toxins, and Chemical Agents, Diptheria
Adams & Victors Principles of Neurology Chp 43, pg 1217, Ropper, A.H.,et al, 2014
Irregular Breathing
In Internal Medicine, Little, Brown & Co, Boston, 3rd Ed, p. 573-574, Cherniack,N.S., 1990