@phdthesis{UNY2083,
          school = {UNY},
            year = {2011},
           month = {November},
           title = {MENINGKATKAN KEMAMPUAN PEMECAHAN MASALAH MATEMATIKA MELALUI PENERAPAN PROBLEM BASED LEARNING PADA SISWA KELAS IX F SMP NEGERI 1 SEDAYU},
          author = {- Nugraheni Cahyaningrum},
             url = {http://eprints.uny.ac.id/2083/}
}