الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f51514869fd2dba4bdd97ab979c21dc7Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2701be50bfd70f8e2557df04c844fa69Testhttps://doi.org/10.1002/9781444346268.ch4Test