الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doajarticles::9b762bf9c99bbe83004b04aea4fd27d2Testhttp://www.ijdvl.com/article.asp?issn=0378-6323;year=1995;volume=61;issue=6;spage=351;epage=353;aulast=RegeTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=doajarticles::a0218378a9a13ac7480ffdaecf383711Testhttp://www.ijdvl.com/article.asp?issn=0378-6323;year=1996;volume=62;issue=4;spage=237;epage=238;aulast=RegeTest