الإتاحة: https://doi.org/10.1007/s10950-006-9019-xTesthttp://hdl.handle.net/2122/2473Test
الإتاحة: https://doi.org/10.1023/A:1009899214734Testhttps://hdl.handle.net/11567/1098994Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=od______3710::13fe42d743c94d3c8d55fed37e598e42Testhttps://hdl.handle.net/11567/1098994Test