الإتاحة: https://doi.org/10.1155/2013/517414Testhttp://hdl.handle.net/2336/333726Test
الإتاحة: https://doi.org/10.1080/23744235.2017.1317359Testhttp://hdl.handle.net/2336/620275Test
الإتاحة: http://hdl.handle.net/2336/620275Test