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MR1781527 (2001m:46068) 46E35 (35Q60) Bourgain, Jean; Brezis, Haïm; Mironescu, Petru On the structure of the Sobolev space $H\sp {1/2}$ with values into the circle. C. R. Acad. Sci. Paris Sér. I Math. 331 (2000), no. 2, 119--124.

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