CUNNINGHAM, M. R. Measuring the Physical in Physical Attractiveness : Quasi-Experiments on the Sociobiology of Female Facial Beauty. J. of Personality and Social Psychology. 1986, 50, 5, 925-935
EKMAN, P. Unmasking the Face : A Guide to Recognising Emotions from Facial Clues. 1975
HENNING, G. B. Some experiments bearing on the hypothesis that the visuals system analyses spatial patterns in independent bands of spatial frequency. Vision Research. 1975, 15, 887-897