?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.aufirst=Amroni&rft.aulast=Umi&rft.au=Umi%2C+Amroni&rft.title=MASALAH+STRUM-LIOUVILLE+SINGULAR+DAN+APLIKASINYA&rft.inst=UNY&rft.degree=S1&rft.date=27+July+2010