Birkhoff, G. D.; Kellogg, O. D. Invariant points in function space. (English) JFM 48.0472.02 Bull. Am. Math. Soc. 28, 236 (1922); Trans. Am. Math. Soc. 23, 96-115 (1922). Reviewer: Tietze, Prof. (München) PDF BibTeX XML Cite \textit{G. D. Birkhoff} and \textit{O. D. Kellogg}, Bull. Am. Math. Soc. 28, 236 (1922; JFM 48.0472.02) Full Text: DOI OpenURL
Fischer, Ch. A. Functions of lines. (English) JFM 48.0472.01 American M. S. Bull. 28, 386 (1922). PDF BibTeX XML Cite \textit{Ch. A. Fischer}, Bull. Am. Math. Soc. 28, 386 (1922; JFM 48.0472.01) OpenURL