URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a849562d289d6c45927d6a6a9e847f23http://www.sciencedirect.com/science/article/pii/S0422763815200994
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::09baaa29ca3eeb3c19909df9c0e06ef6https://doi.org/10.4236/ojrd.2014.42006
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::95f7d195cb804ad4761b5c2dd136c62ahttps://doi.org/10.4236/ojrd.2014.41003
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::543d35b3cb39f21368d9f4e49e492571https://doi.org/10.4236/ojrd.2014.41002