https://etd.repository.ugm.ac.id/penelitian/detail/50192000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/50672000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/50732000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/54002000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/54012000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/57752000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/57762000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/57772000never1.0https://etd.repository.ugm.ac.id/penelitian/detail/57782000never1.0