Wagner AD, Pare-Blagoev EJ, Clark J, Poldrack RA.Recovering meaning: left prefrontal cortex guides controlled semantic retrieval. Neuron. 2001 Aug 2;31(2):329-38. [http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=11502262 pubmed] | [attachment:Wagner11502262.pdf pdf]