MathSciNet bibliographic data MR2365668 (2009b:49032) 49J45 (49Q20 82D25) Caraballo, David G. Crystals and polycrystals in \$\Bbb R\sp n\$$\Bbb R\sp n$: lower semicontinuity and existence. J. Geom. Anal. 18 (2008), no. 1, 68–88. Article

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