Gleaning Information for Cognitive Operations from Don't Know Responses in Cognitive and Noncognitive Assessments.
Ip EH, Magee MF, Youssef GA, Chen SH. Gleaning Information for Cognitive Operations from Don't Know Responses in Cognitive and Noncognitive Assessments. Multivariate Behav Res. 2019 Mar-Apr; 54(2):159-172.