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Landsheer JA, van den Wittenboer G.Landsheer JA, et al.Behav Res Methods Instrum Comput. 2000 Nov;32(4):528-36. doi: 10.3758/bf03200825.Behav Res Methods Instrum Comput. 2000.PMID: 11189853
Landsheer JA, van den Wittenboer G.Landsheer JA, et al.Behav Res Methods Instrum Comput. 2002 Feb;34(1):117-27. doi: 10.3758/bf03195430.Behav Res Methods Instrum Comput. 2002.PMID: 12060985