https://etd.repository.ugm.ac.id/penelitian/detail/456292010never1.0https://etd.repository.ugm.ac.id/penelitian/detail/456302010never1.0https://etd.repository.ugm.ac.id/penelitian/detail/456312010never1.0https://etd.repository.ugm.ac.id/penelitian/detail/456322010never1.0https://etd.repository.ugm.ac.id/penelitian/detail/456452010never1.0https://etd.repository.ugm.ac.id/penelitian/detail/456462010never1.0https://etd.repository.ugm.ac.id/penelitian/detail/456472010never1.0https://etd.repository.ugm.ac.id/penelitian/detail/456482010never1.0https://etd.repository.ugm.ac.id/penelitian/detail/458922010never1.0https://etd.repository.ugm.ac.id/penelitian/detail/462282010never1.0https://etd.repository.ugm.ac.id/penelitian/detail/462292010never1.0https://etd.repository.ugm.ac.id/penelitian/detail/490532010never1.0