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Deviatov, E. V. and Dolgopolov, V. T. and Würtz, A. and Wixforth, A. and Wegscheider, Werner and Campman, K. L. and Gossard, A. C. (2005) Topological defects in the edge-state structure in a bilayer electron system. Physical Review B (PRB) 72 (4), 041305R.