Affiliation: | 1. Center of Polymer Studies and Physics Department, Boston University, Boston, Massachusetts, 02215 2. Minerva Center and Department of Physics, Bar-Ilan University, Ramat Gan, Israel 3. BP Exploration Operating Company Ltd., Sunbury-on-Thames, Midds., TW16 7LN, U.K 4. Department of Engineering, Cambridge University, Cambridge, U.K
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