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1 An Economic Theory of Political Action in a Democracy, Journal of Political Economy Vol. 65, No. 2 (Apr., 1957), pp. 135-150

2 Sexual selection and physical attractiveness, Human Nature September 1993, Volume 4, Issue 3, pp 205-235

3 Robert D. Putnam, Robert Leonardi, Raffaella Y, Making Democracy Work: Civic Traditions in Modern Italy, Pages displayed by permission of Princeton University Press. Copyright.

4 Walster, Elaine; Aronson, Vera; Abrahams, Darcy; Rottman, Leon, Importance of physical attractiveness in dating behavior., Journal of Personality and Social Psychology, Vol 4(5), Nov 1966, 508-516.

5 Ellen Berscheid, Physical Attractiveness, Advances in Experimental Social Psychology Volume 7, 1974, Pages 157-215

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