TY - JOUR T1 - Personality Differences and Biological Variations. A Study of Twins JF - Journal of Medical Genetics JO - J Med Genet SP - 116 LP - 117 DO - 10.1136/jmg.12.1.116-a VL - 12 IS - 1 AU - D. W. K. Kay Y1 - 1975/03/01 UR - http://jmg.bmj.com/content/12/1/116.2.abstract N2 - 300 Multiple ChoicesThis is a pdf-only article and there is no markup to show you.full-text.pdf ER -