On the division of short-term and working memory: an examination of simple and complex span and their relation to higher order abilities
Psychological Bulletin (2007) - Comment
pubmed: 17967093  doi: 10.1037/0033-2909.133.6.1038  issn: 0033-2909  issn: 1939-1455 

Nash Unsworth, Randall W. Engle