An Investigation to Validate the Grammar and Phonology Screening (GAPS) Test to Identify Children with Specific Language Impairment van der Lely, Heather K. J. ; Payne, Elisabeth ; McClelland, Alastair Abstract Publication: PLoS ONE Pub Date: July 2011 DOI: 10.1371/journal.pone.0022432 Bibcode: 2011PLoSO...622432V