Brauer K, Häusser M, Härtig W, Arendt T. (2000). The core-shell dichotomy of nucleus accumbens in the rhesus monkey as revealed by double-immunofluorescence and morphology of cholinergic interneurons. Brain research. 858 [PubMed]
Gruber AJ, Dayan P, Gutkin BS, Solla SA. (2006). Dopamine modulation in the basal ganglia locks the gate to working memory. Journal of computational neuroscience. 20 [PubMed]