* [http://lup.lub.lu.se/luur/download?func=downloadFile&recordOId=2278521&fileOId=2278522 Lund University, Almashramah M.S. thesis] p.5 -8 | * [http://lup.lub.lu.se/luur/download?func=downloadFile&recordOId=2278521&fileOId=2278522 Lund University, Almashramah M.S. thesis] p.5 -8 |