1. Birth order and intelligence: A within-family analysis using Swedish military conscription data;Barclay;Stockholm Research Reports in Demography,2014
2. Birth order and mortality: A population-based cohort study;Barclay;Stockholm Research Reports in Demography,2013
3. Opposite-sex twins and adolescent same-sex attraction;Bearman;American Journal of Sociology,2002
4. Intelligence test scores and birth order among young Norwegian men (conscripts) analyzed within and between families;Bjerkedal;Intelligence,2007
5. Intergenerational effects in Sweden: What can we learn from adoption data?;Björklund,2004