?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Portal%2C+Matthew.&rft.aufirst=Matthew.&rft.aulast=Portal&rft.degree=Doctoral&rft.title=Understanding%2C+language+and+development+%3A+towards+a+reassessment+in+the+educational+context&rft.inst=Institute+of+Education%2C+University+of+London&rft.tpages=284&rft.date=2002