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McIntyre MH (December 2003). "Digit ratios, childhood gender role behavior, and erotic role preferences of gay men". Archives of Sexual Behavior32 (6): 495–6. doi:10.1023/A:1026054625638. பப்மெட்:14627046.
Arató M, Frecska E, Beck C, An M, Kiss H (January 2004). "Digit length pattern in schizophrenia suggests disturbed prenatal hemispheric lateralization". Progress in Neuro-psychopharmacology & Biological Psychiatry28 (1): 191–4. doi:10.1016/j.pnpbp.2003.09.020. பப்மெட்:14687873.