Lefschetz, S. Chain-deformations in topology. (English) Zbl 0011.18002 Duke Math. J. 1, 1-18 (1935). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 2 Documents Keywords:topology PDFBibTeX XMLCite \textit{S. Lefschetz}, Duke Math. J. 1, 1--18 (1935; Zbl 0011.18002) Full Text: DOI