Nyberg, L., Marklund, P., Persson, J., Cabeza, R., Forkstam, C., Petersson, K. M., et al. (2003).
Common prefrontal activations during working memory, episodic memory, and semantic memory. Neuropsychologia,
41(3), 371-377. doi:10.1016/S0028-3932(02)00168-9.