الإتاحة: https://doi.org/10.1080/00207179.2014.883171Testhttps://lup.lub.lu.se/record/4558824Test
الإتاحة: https://doi.org/10.3182/20090706-3-FR-2004.00039Testhttps://lup.lub.lu.se/record/104be4de-431c-4588-b263-4fb7669dc63aTest