1. Comparison chez le rat entre l'analgesie induite par stimulation de la substance grise periaqueducale et l'analgesic morphinique;Akil;Cr. hebd. Séanc. Acad. Sci., Paris.,1972
2. Antagonism of stimulation-produced analgesia by naloxone, a narcotic antagonist;Akil;Science,1976
3. Appearance of beta-endorphin-like immunoreactivity in human ventricular cerebrospinal fluid upon analgesic electrical stimulation;Akil,1978
4. Enkephalin-like material elevated in ventricular cerebrospinal fluid of pain patients after analgetic focal stimulation;Akil;Science,1978
5. β-endorphin and other 31K fragments: Pituitary and brain systems;Akil,1978