Howden-Chapman, Philippa, Anna Matheson, Julian Crane, Helen Viggers, Malcolm Cunningham, Tony Blakely, Chris Cunningham, et al. 2007. “Effect of Insulating Existing Houses on Health Inequality: Cluster Randomised Study in the Community”. BMJ 334. BMJ Publishing Group Ltd: 460. doi:10.1136/bmj.39070.573032.80.