Open Access System for Information Sharing

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PHYSICAL REVIEW LETTERS, vol. 79, no. 11, page. 2038 - 2041, 1997-09-15

PHYSICAL REVIEW LETTERS, vol. 84, no. 11, page. 2425 - 2428, 2000-03-13

PHYSICAL REVIEW LETTERS, vol. 96, no. 9, 2006-03-10

PHYSICAL REVIEW LETTERS, vol. 107, no. 13, 2011-09-21