الوصول الحر: https://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-166185Testhttps://liu.diva-portal.org/smash/get/diva2:1437701/FULLTEXT01.pdfTest
الوصول الحر: https://gup.ub.gu.se/publication/296173Test