van Nues SJ, van der Zande WL, Donjacour CE, van Mierlo P, Jan Lammers G (2011). "The clinical features of cataplexy: A questionnaire study in narcolepsy patients with and without hypocretin-1 deficiency". Sleep Medicine. 12 (1): 12–18. doi:10.1016/j.sleep.2010.05.010. PMID21145280.
van Nues SJ, van der Zande WL, Donjacour CE, van Mierlo P, Jan Lammers G (2011). "The clinical features of cataplexy: A questionnaire study in narcolepsy patients with and without hypocretin-1 deficiency". Sleep Medicine. 12 (1): 12–18. doi:10.1016/j.sleep.2010.05.010. PMID21145280.