11.11 Fertility patterns
Ang, S. A., Rodgers, Wanstrom, L. (2010).  The Flynn Effect within subgroups in the U.S:  Gender, race, income, education, and urbanization differences in NLSY-Children data.  Intelligence, 38. 367- 384
Lynn, R. & Harvey, J. (2008).  The decline of the world’s IQ.  Intelligence, 36(2), 112-120.
Sundet, J. M., Borren, I., & Tambs, K. (2008). The Flynn effect is partly caused by changing fertility patterns. Intelligence, 36(3), 183-191.