Beard, E., Aveyard, P., Brown, J., & West, R. (2012). Assessing the association between the use of NRT for smoking reduction and attempts to quit smoking using propensity score matching. Elsevier.

Beard, E., P. Aveyard, J. Brown, and R. West. Assessing the Association Between the Use of NRT for Smoking Reduction and Attempts to Quit Smoking Using Propensity Score Matching. Elsevier, 2012.

Beard, E., et al. Assessing the Association Between the Use of NRT for Smoking Reduction and Attempts to Quit Smoking Using Propensity Score Matching. Elsevier, 2012.