By Ata-Allah S.S.   Fayek M.K.   Refai H.S.   Mostafa M.F.   in Journal of Solid State Chemistry

ISSN:0022-4596|149|2|434-442

Academic Press‎(2000)‎

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By Mostafa M. F.   Youssef A. A. A.   Khiyami S. S.   in Philosophical Magazine

ISSN:1478-6443|87|23|3449-3466

Taylor & Francis Ltd‎(2007)‎

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