@phdthesis{UNY1859,
           title = {ANALISIS SPEKTRAL DALAM PENENTUAN PERIODISITAS TERSEMBUNYI DARI DATA RUNTUN WAKTU (TIME SERIES)},
          school = {UNY},
            year = {2010},
          author = {Setiyo Rini Iin},
             url = {http://eprints.uny.ac.id/1859/}
}