?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Ajournal&rft.aufirst=Gendro&rft.aulast=Wahayuhono&rft.au=Wahayuhono%2C+Gendro&rft.date=1979&rft.atitle=Preliminary+Study+of+Sero-Immunity+to+Polioviruses+in+an+Urban+Population+in+Indonesia&rft.genre=article