?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.au=Winarti%2C+-&rft.aulast=Winarti&rft.aufirst=-&rft.issue=795&rft.date=2017&rft.atitle=Development+of+two+tier+test+to+assess+conceptual+understanding+in+heat+and+temperature&rft.title=Journal+of+Physics%3A+Conference+Series&rft.pages=1-6&rft.genre=article