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Physical review letters, 84 (2000) S. 4914
OpenAccess 
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Physical Review E Physical review / E, 59 59 (1999 1999) 5 5, S. 5600-5605 5600-5605
OpenAccess  OpenAccess 
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Physical review letters, 81 (1999) S. 5141 - 5144
OpenAccess 
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Physical review letters, 82 (1999) S. 1506 - 1509
OpenAccess 
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