Having a male co-twin masculinizes mental rotation performance in females
Psychological Science (2010) - Comment
pubmed: 20581340  doi: 10.1177/0956797610376075  issn: 1467-9280  issn: 0956-7976 

Eero Vuoksimaa, Jaakko Kaprio, William S. Kremen, Laura Hokkanen, Richard J. Viken, Annamari Tuulio-Henriksson, Richard J. Rose