?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=Jennifer&rft.au=Ewers-Rogers%2C+Jennifer&rft.aulast=Ewers-Rogers&rft.date=2002&rft.title=Very+young+children's+understanding+and+use+of+numbers+and+number+symbols&rft.inst=Institute+of+Education%2C+University+of+London&rft.tpages=271&rft.degree=Doctoral