الوصول الحر: https://doaj.org/article/28d8fe359bb44685b4c485a6aae9313fTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::f36a88877985c2b0be22a7cfdbd2f41bTesthttps://doi.org/10.1186/s13065-019-0639-yTest