?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aulast=Piggott&rft.au=Piggott%2C+Jennifer+Susan&rft.aufirst=Jennifer+Susan&rft.date=2004&rft.title=An+investigation+into+the+nature+of+mathematical+enrichment+%3A+A+case+study+of+implementation&rft.inst=Institute+of+Education%2C+University+of+London&rft.tpages=216&rft.degree=Doctoral