الإتاحة: http://etd.adm.unipi.it/theses/available/etd-07092012-173830Test/
الإتاحة: https://doi.org/10.1007/s00592-015-0800-6Testhttp://hdl.handle.net/11568/763653Test
الإتاحة: https://doi.org/10.1007/s00592-015-0800-6Test