Wallace, A. D. A fixed-point theorem for trees. (English) Zbl 0063.08139 Bull. Am. Math. Soc. 47, 757-760 (1941). Not reviewed Cited in 1 ReviewCited in 14 Documents PDFBibTeX XMLCite \textit{A. D. Wallace}, Bull. Am. Math. Soc. 47, 757--760 (1941; Zbl 0063.08139) Full Text: DOI