MathSciNet bibliographic data MR2680419 58E20 (35B44 35L70 35Q40 81T10) Rodnianski, Igor; Sterbenz, Jacob On the formation of singularities in the critical ${\rm O}(3)$${\rm O}(3)$ $\sigma$$\sigma$-model. Ann. of Math. (2) 172 (2010), no. 1, 187–242. Article

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