https://etd.repository.ugm.ac.id/penelitian/detail/137142000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/137162000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/137172000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/137182000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/154412000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/154422000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/154432000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/154482000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/154512000never1.0