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55Q25 Hopf invariants (2 articles)

• Wierstra, Felix: Hopf Invariants and Differential Forms. (English). Higher Structures, vol. 3 (2019), issue 1, pp. 67-108
• Akhmet'ev, Pjotr; Szűcs, András: Geometric proof of the easy part of the Hopf invariant one theorem. (English). Mathematica Slovaca, vol. 49 (1999), issue 1, pp. 71-74