https://etd.repository.ugm.ac.id/penelitian/detail/138282000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/138302000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/139412000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/155182000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/155362000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/155602000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/155622000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/155822000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/156332000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/2672312000never1.0