URL الوصول: https://doaj.org/article/5845c3dbd4e846ab9d75a35edd585b28
URL الوصول: https://explore.openaire.eu/search/publication?articleId=od______3377::335c970ddfb273ad6d100f3938ce146ehttps://elar.rsvpu.ru/handle/123456789/42256