Feit, Julia, et al. “Effect of a Single Dose of Methadone on the Functioning of Visuo-Spatial Working Memory in Opiate Dependent Individuals With HIV(+) Treated With Methadone”. Medical and Biological Sciences, vol. 26, no. 2, June 2012, pp. 5-9, doi:10.12775/v10251-012-0028-4.