Loomis, Alfred L; Harvey EN, Hobart GA (1937). „III Cerebral states during sleep, as studied by human brain potentials”. J Exp Psychol.21: 127–44. DOI:10.1037/h0057431. ISSN0022-1015.
Cirelli, Chiara; Giulio Tononi (2008-08-26). „Is Sleep Essential?” (Essay). PLoS Biol (Public Library of Science) 6 (8): e216. DOI:10.1371/journal.pbio.0060216. PMC2525690. PMID18752355. Pristupljeno 2009-04-21. »... it would seem that searching for a core function of sleep, particularly at the cellular level, remains a worthwhile exercise«
Psychology World (1998). „Stages of Sleep” (PDF). Arhivirano iz originala na datum 2008-06-26. Pristupljeno 15. 6. 2008. »(includes illustrations of "sleep spindles" and "K-complexes")«
Cirelli, Chiara; Giulio Tononi (2008-08-26). „Is Sleep Essential?” (Essay). PLoS Biol (Public Library of Science) 6 (8): e216. DOI:10.1371/journal.pbio.0060216. PMC2525690. PMID18752355. Pristupljeno 2009-04-21. »... it would seem that searching for a core function of sleep, particularly at the cellular level, remains a worthwhile exercise«
Cirelli, Chiara; Giulio Tononi (2008-08-26). „Is Sleep Essential?” (Essay). PLoS Biol (Public Library of Science) 6 (8): e216. DOI:10.1371/journal.pbio.0060216. PMC2525690. PMID18752355. Pristupljeno 2009-04-21. »... it would seem that searching for a core function of sleep, particularly at the cellular level, remains a worthwhile exercise«
Psychology World (1998). „Stages of Sleep” (PDF). Arhivirano iz originala na datum 2008-06-26. Pristupljeno 15. 6. 2008. »(includes illustrations of "sleep spindles" and "K-complexes")«
Loomis, Alfred L; Harvey EN, Hobart GA (1937). „III Cerebral states during sleep, as studied by human brain potentials”. J Exp Psychol.21: 127–44. DOI:10.1037/h0057431. ISSN0022-1015.