https://etd.repository.ugm.ac.id/penelitian/detail/1353902004never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1356722004never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1377652004never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1410202004never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1412602004never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1418362004never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1425252004never1.0https://etd.repository.ugm.ac.id/penelitian/detail/1426862004never1.0