Fentanyl (Sublimase) and Ketamine Report looking at whether or not ketamine can prevent fentanyl-induced analgesia. http://opioids.com/fentanyl/fentket.html
John Lilly, Ketamine and the Entities from ECCO Article by Adam Gorightly, detailing the experiment attempting to use Ketamine to alleviate the pain of migraines, and what they discovered the effects to be. http://www.conspiracyarchive.com/UFOs/Gorightly.htm
Ketamine (Ketalar) Report into the behavioural effects of ketamine, an NMDA glutamatergic antagonist, in non-human primates. http://www.biopsychiatry.com/ketamine.htm
