MathSciNet bibliographic data MR2094472 58J45 (35L05) Krieger, Joachim Global regularity of wave maps from \$\bold R^{2+1}\$$\bold R^{2+1}$ to \$H^2\$$H^2$. Small energy. Comm. Math. Phys. 250 (2004), no. 3, 507–580. Article

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