URL الوصول: https://doaj.org/article/9ec92cb219984acda58c834e4971be9d
URL الوصول: https://doaj.org/article/daf7888d46ec4187881cd1d1849ac73f
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::5af036789d54d8d50aac83af69b05144https://doi.org/10.1111/j.1467-8535.2009.01000.x