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PK Gregersen, E Kowalsky, W Li (2007), "Reply to Henthorn and Deutsch -- Ethnicity versus early environment: Comment on 'Early childhood music education and predisposition to absolute pitch: teasing apart genes and environment", American Journal of Medical Genetics, 143A:104-105. [PDF]
PK Gregersen, E Kowalsky, A Lee, S Baron-Cohen, SE Fisher, JE Asher, D Ballard, J Freudenberg, W Li (2013), "Absolute pitch exhibits phenotypic and genetic overlap with synesthesia", Human Molecular Genetics. [PDF]