Examining the time course of young and older adults' mimicry of enjoyment and nonenjoyment smiles
Emotion (2014) - Comment
pubmed: 24798677  doi: 10.1037/a0035825  issn: 1931-1516  issn: 1528-3542 

Gillian Slessor, Phoebe E. Bailey, Peter G. Rendell, Ted Ruffman, Julie D. Henry, Lynden K. Miles