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2. The sleeping brain,1972
3. Ueber das elektroenkephalogramm des menschen;Berger;J Psychol Neurol,1930
4. Cerebral states during sleep, as studied by human brain potentials;Loomis;J Exp Psychol,1937
5. Regularly occurring periods of eye motility, and concomitant phenomena;Aserinsky;Science,1953