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van Lier RJ, Leeuwenberg EL, van der Helm PA.van Lier RJ, et al. Among authors: van der helm pa.Psychol Res. 1997;60(3):134-43. doi: 10.1007/BF00419761.Psychol Res. 1997.PMID: 9411458
van der Helm PA, Leeuwenberg EL.van der Helm PA, et al.Psychol Rev. 1996 Jul;103(3):429-56. doi: 10.1037/0033-295x.103.3.429.Psychol Rev. 1996.PMID: 8759043Review.
van der Vloed G, Csathó A, van der Helm PA.van der Vloed G, et al. Among authors: van der helm pa.Psychol Res. 2007 Mar;71(2):170-7. doi: 10.1007/s00426-005-0002-x. Epub 2005 Aug 9.Psychol Res. 2007.PMID: 16088414