الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::085e7649642b849c5e10ac74a2a7b4fcTesthttps://doi.org/10.1002/9783527629176.ch8Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::d8cf26f3cc90be45b9004b5425d45b06Testhttps://doi.org/10.1002/352760880x.ch10Test