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Decomposition of ${\mathbb S}^1$-valued maps in Sobolev spaces
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Lifting in Sobolev spaces
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On some questions of topology for ${\mathbb S}^1$-valued fractional Sobolev s...
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Lifting default for ${\mathbb S}^1$-valued maps
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Phases of unimodular complex valued maps: optimal estimates, the factorizatio...
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