https://etd.repository.ugm.ac.id/penelitian/detail/51792000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/51842000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/52202000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/52212000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/52222000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/53612000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/53622000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/53632000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/53642000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/55652000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/55662000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/56322000never1.0