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Hähl, H. Differentiable Fibrations of the (2N-1)-Sphere by Great (N-1-Spheres and Their Coord Inatization over Quasifields. Results. Math. 12, 99–118 (1987). https://doi.org/10.1007/BF03322382
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DOI: https://doi.org/10.1007/BF03322382