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MODERN PHYSICS LETTERS B, vol. 13, no. 26, page. 925 - 932, 1999-11-10

PHYSICS LETTERS A, vol. 226, no. 1-2, page. 17 - 21, 1997-02-10

SUPERLATTICES AND MICROSTRUCTURES, vol. 26, no. 6, page. 405 - 412, 1999-12

JOURNAL OF PHYSICS A-MATHEMATICAL AND GENERAL, vol. 34, no. 46, page. 9793 - 9801, 2001-11-23

PHYSICAL REVIEW B, vol. 60, no. 24, page. 16874 - 16879, 1999-12-15