الإتاحة: https://doi.org/20.500.12627/178590Testhttps://doi.org/10.1111/cen.14662Testhttps://hdl.handle.net/20.500.12627/178590Test
الإتاحة: https://doi.org/20.500.12627/149844Testhttps://hdl.handle.net/20.500.12627/149844Test
الإتاحة: https://doi.org/20.500.12627/156501Testhttps://doi.org/10.1515/jpem-2012-0053Testhttps://hdl.handle.net/20.500.12627/156501Test
الإتاحة: https://doi.org/20.500.12627/164475Testhttps://doi.org/10.1111/cen.12127Testhttps://hdl.handle.net/20.500.12627/164475Test