@phdthesis{UNY21430,
           month = {October},
          author = {Daniel Adi Nugroho},
           title = {STUDI TENTANG SEL SURYA BERBASIS TITANIA MELALUI
PENYISIPAN LOGAM BESI PADA LAPISAN AKTIF TITANIA},
          school = {Universitas Negeri Yogyakarta},
            year = {2013},
             url = {http://eprints.uny.ac.id/21430/}
}