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APPLIED PHYSICS LETTERS, vol. 75, no. 24, page. 3775 - 3777, 1999-12-13

APPLIED PHYSICS LETTERS, vol. 71, no. 7, page. 977 - 979, 1997-08-18

APPLIED PHYSICS LETTERS, vol. 72, no. 4, page. 433 - 435, 1998-01-26

APPLIED PHYSICS LETTERS, vol. 74, no. 15, page. 2176 - 2178, 1999-04-12