"Don't know" responding to answerable and unanswerable questions during misleading and hypnotic interviews
Journal of Experimental Psychology Applied (2008) - Comment
pubmed: 18808279  doi: 10.1037/1076-898x.14.3.255  issn: 1076-898x  issn: 1939-2192 

Alan Scoboria, Giuliana Mazzoni, Irving Kirsch