الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4a685a3e0347157538db38c6b16abde6Testhttp://www.sciencedirect.com/science/article/pii/S0102695X17306725Test
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6b4670daa88ae19122b411006e621becTesthttp://www.sciencedirect.com/science/article/pii/S0102695X17301011Test