Gale, C.R., Johnson, W., Deary, I.J., Schoon, I. and Batty, D. (2009) ‘Intelligence in girls and their subsequent smoking behaviour as mothers: the 1958 National Child Development Study and the 1970 British Cohort Study’, International Journal of Epidemiology, 38, 11, pp. 173-181, 10.1093/ije/dyn201