الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::c90de4a377101bfb09e587682e26d281Testhttps://doi.org/10.1111/j.1541-0420.2007.00905_2.xTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::6f3c3f428c5f70f2d2f96ca1e6a9fbb2Testhttps://doi.org/10.2307/2532863Test