MathSciNet bibliographic data MR759659 30D45 (30C99 30D40 30H05) Antonino, José A.; Romaguera, Salvador A short proof of the Cima-Wogen $L(f)={\rm circle}$$L(f)={\rm circle}$ theorem. Proc. Amer. Math. Soc. 92 (1984), no. 3, 391–392. Article

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