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PHYSICAL REVIEW B, vol. 52, no. 13, page. 9159 - 9161, 1995-10-01
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PHYSICAL REVIEW B, vol. 50, no. 23, page. 17139 - 17142, 1994-12-15
PHYSICAL REVIEW B, vol. 49, no. 14, page. 9555 - 9559, 1994-04-01