الوصول الحر: https://doaj.org/article/62425b3b3752406982b71e5f88b74ff4Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8c41ce107d3c9333bca85d04d0c2d2b8Testhttps://vavilov.elpub.ru/jour/article/view/704Test