Cortical capacity constraints for visual working memory: dissociation of fMRI load effects in a fronto-parietal network. - David E. J. Linden; Robert A. Bittner; Lars Muckli; James A. Waltz; Nikolaus Kriegeskorte; Rainer Goebel; Wolf Singer; Matthias H. J. Munk (NeuroImage, 2003)