الإتاحة: http://hdl.handle.net/2078.1/91277Test
الإتاحة: https://doi.org/10.1017/s0022377814000713Testhttp://hdl.handle.net/2078.1/201857Test
الإتاحة: https://doi.org/10.1016/j.physleta.2013.09.017Testhttp://hdl.handle.net/2078.1/160601Test