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Burke , P. H. 1971 . Stereophotogrammatic measurement of normal facial asymmetry in children . Human Biology , 43 : 536 – 548 .
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Ekman , P. 1979 . “ About brows: Emotional and conversational signals ” . In Human ethology , Edited by: von Cranach , M. , Foppa , K. , Lepenies , W. and Ploog , D. Cambridge : Cambridge University Press .
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