MathSciNet bibliographic data MR2134864 53A10 (53C42) Abresch, Uwe; Rosenberg, Harold A Hopf differential for constant mean curvature surfaces in ${\bf S}\sp 2\times{\bf R}$${\bf S}\sp 2\times{\bf R}$ and ${\bf H}\sp 2\times{\bf R}$${\bf H}\sp 2\times{\bf R}$. Acta Math. 193 (2004), no. 2, 141–174. Article

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