الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ec94d4c40c730abd7742c3e5984ebbdaTesthttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-69912019000300157&lng=en&tlng=enTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::49e69b425c1df8979035109c6ff5b457Testhttp://aquichan.unisabana.edu.co/index.php/aquichan/article/view/9419Test