https://etd.repository.ugm.ac.id/penelitian/detail/133142000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/133242000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/133252000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/133272000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/137862000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/137872000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/155482000never1.0