The sleeper effect: Artifact or phenomenon-A brief comment on Bell et al. (2013)
Journal of Consulting and Clinical Psychology (2015) - Comment
pubmed: 25822243  doi: 10.1037/a0037220  issn: 1939-2117  issn: 0022-006x 

Christoph Flückiger, A. C. Del Re, Bruce E. Wampold