الإتاحة: http://www.osti.gov/servlets/purl/976307Testhttps://www.osti.gov/biblio/976307Test
الإتاحة: http://www.osti.gov/servlets/purl/975515Testhttps://www.osti.gov/biblio/975515Test
الإتاحة: https://digital.library.unt.edu/ark:/67531/metadc720953Test/
الإتاحة: https://digital.library.unt.edu/ark:/67531/metadc707360Test/
الوصول الحر: http://www.osti.gov/scitech/servlets/purl/760531Test