?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=Ratna+Dewi&rft.aulast=Lestyorini&rft.au=Lestyorini%2C+Ratna+Dewi&rft.date=27+July+2010&rft.degree=S1&rft.title=PENGEMBANGAN+SISTEM+INFORMASI+ILMUWAN+MATEMATIKA&rft.inst=UNY