?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Nila+Kesumawati&rft.aulast=Nila+Kesumawati&rft.au=Nila+Kesumawati%2C+Nila+Kesumawati&rft.date=2011&rft.title=PROCEEDINGS+International+Seminar+and+the+Fourth+National+Conference+on+Mathematics+Education&rft.atitle=Development+Mathematical+Problem+Solving+Problems+At+Junior+High+School+&rft.issn=978-979-16353-7-0&rft.genre=article