Marian Stewart Bartlett Gwen Littlewort Mark G. Frank Claudia Lainscsek Ian R. Fasel Javier R. Movellan Automatic Recognition of Facial Actions in Spontaneous Expressions. 22-35 2006 1 J. Multim. 6 https://doi.org/10.4304/jmm.1.6.22-35 db/journals/jmm2/jmm1.html#BartlettLFLFM06