Dempsey, Orla (2011) Developing and implementing models for the prevalence, incidence and geographic spread of opiate use in Ireland. PhD thesis, Trinity College Dublin.

Dempsey, Orla and Comiskey, Catherine (2011) Estimating the incidence of hidden, untreated opiate use. Mathematical Population Studies, 18, (3), pp. 172-188. https://doi.org/10.1080/08898480.2011.589764.