1. “Frontiers in Neuroendocrinology”;de Wied,1969
2. “Peptides in Neurobiology”;Brownstein,1977
3. Identification of two related pentapeptides from the brain with potent opiate agonist activity
4. “Central Nervous System Effects of Hypothalamic Hormones and Other Peptides”;van Wimersma Greidanus,1979
5. “Endogenous Peptides and Learning and Memory Processes”;Martin,1981