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PHYSICAL REVIEW B, vol. 48, no. 9, page. 6217 - 6224, 1993-09-01

PHYSICAL REVIEW B, vol. 49, no. 23, page. 16248 - 16255, 1994-06-15

MATERIALS LETTERS, vol. 12, no. 4, page. 233 - 241, 1991-11

PHYSICAL REVIEW B, vol. 46, no. 24, page. 15689 - 15696, 1992-12-15

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