الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_________::498f3e85a5b847ddd69dc1c002a2794bTesthttps://doi.org/10.1016/s0169-5002Test(05)80570-7
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::4cd0c9edeabffa413636d78e44745658Test