URL الوصول: https://lup.lub.lu.se/record/143150https://portal.research.lu.se/files/4768490/624936.pdfhttp://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=16042372&dopt=Abstracthttp://dx.doi.org/10.1080/03008820510040685
URL الوصول: https://explore.openaire.eu/search/publication?articleId=od_______185::f268d35c96f4076deff095da157353fbhttps://infoscience.epfl.ch/record/88233