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PHYSICAL REVIEW B, vol. 52, no. 13, page. 9159 - 9161, 1995-10-01
PHYSICAL REVIEW B, vol. 51, no. 24, page. 17635 - 17641, 1995-06-15
PHYSICAL REVIEW B - CONDENSED MATTER AND MATERIALS PHYSICS, vol. 51, page. 5058, 1995-05
PHYSICAL REVIEW B, vol. 51, no. 8, page. 5058 - 5060, 1995-02-15