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CRYSTAL RESEARCH AND TECHNOLOGY, vol. 35, no. 1, page. 19 - 27, 2000-01
SYNTHETIC METALS, vol. 117, no. 1-3, page. 249 - 251, 2001-02-15
ADVANCED MATERIALS FOR OPTICS AND ELECTRONICS, vol. 10, no. 1, page. 17 - 23, 2000-01