On the Tip-of-the-Tongue: Neural Correlates of Increased Word-finding Failures in Normal Aging. - Meredith A. Shafto; Deborah M. Burke; Emmanuel A. Stamatakis; Phyllis P. Tam; Lorraine K. Tyler (J. Cogn. Neurosci., 2007)

Word Retrieval Failures in Old Age: The Relationship between Structure and Function. - Meredith A. Shafto; Emmanuel A. Stamatakis; Phyllis P. Tam; Lorraine K. Tyler (J. Cogn. Neurosci., 2010)