H1/2 maps with values into the circle : minimal connections, lifting, and the Ginzburg–Landau equation
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Jean Bourgain, Haim Brezis, Petru Mironescu (2004)
Publications Mathématiques de l'IHÉS
M. Atteia, A. Elqortobi (1991)
RAIRO - Operations Research - Recherche Opérationnelle
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