https://etd.repository.ugm.ac.id/penelitian/detail/132372000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/132442000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/132452000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/132502000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/132532000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/132552000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/132562000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/132572000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/132602000never1.0