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Giménez MC, Hessels M, van de Werken M, de Vries B, Beersma DG, Gordijn MC.Giménez MC, et al. Among authors: beersma dg.Chronobiol Int. 2010 Jul;27(6):1219-41. doi: 10.3109/07420528.2010.496912.Chronobiol Int. 2010.PMID: 20653451
van den Burg W, Bouhuys AL, van den Hoofdakker RH, Beersma DG.van den Burg W, et al. Among authors: beersma dg.J Affect Disord. 1990 Jun;19(2):109-17. doi: 10.1016/0165-0327(90)90015-z.J Affect Disord. 1990.PMID: 2142697Free article.
Meesters Y, Jansen JH, Beersma DG, Bouhuys AL, van den Hoofdakker RH.Meesters Y, et al. Among authors: beersma dg.Br J Psychiatry. 1995 May;166(5):607-12. doi: 10.1192/bjp.166.5.607.Br J Psychiatry. 1995.PMID: 7620745Clinical Trial.