(Public Athos. New York). 53. Ekman P. Sorenson ER Friesen VN (1969) Pal cultural elements In facial denims of emotion. Science 164(36751'.86-88. SA Hunan Pi Davidson N. Friesen WV119901 The Mechem» smile: Emotional repression and bah physiology. II. / Pars Soc Psycho/ 58(2/342-353. SS. Reed It Zeglen KN. Schmidt Ki. (2012)