MathSciNet bibliographic data MR745314 (85k:58011) 58C25 (26A24 46E35) Bromberg, Shirley An extension theorem in the class \$C\sp{1}\$$C\sp{1}$. (Spanish) Bol. Soc. Mat. Mexicana (2) 27 (1982), no. 2, 35–44. Links to the journal or article are not yet available

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