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ACKNOWLEDGMENTS
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5. L.H. Zhang and R.V. Koka, Mater. Chem. Phy. 57, 23 (1998).
This work was supported by Science Foundation of
Gansu Province, People’s Republic of China, under
Grant No. ZR-96-063, and this support is gratefully ac-
knowledged. Support for one of us (Z.A.M.) by the
United States Army Research Office is gratefully
acknowledged.
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