Shortened complex span tasks can reliably measure working memory capacity
Memory & Cognition (2015) - Comment
pubmed: 25217113  doi: 10.3758/s13421-014-0461-7  issn: 1532-5946  issn: 0090-502x 

Jeffrey L. Foster, Zach Shipstead, Tyler L. Harrison, Kenny L. Hicks, Thomas S. Redick, Randall W. Engle