Chang, Su-Cheng; Whitehead, J. H. C. Note on cohomology systems. (English) Zbl 0045.44103 Q. J. Math., Oxf. II. Ser. 2, 167-174 (1951). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 Review MSC: 55Qxx Homotopy groups Keywords:Topology PDFBibTeX XMLCite \textit{S.-C. Chang} and \textit{J. H. C. Whitehead}, Q. J. Math., Oxf. II. Ser. 2, 167--174 (1951; Zbl 0045.44103) Full Text: DOI