MathSciNet bibliographic data MR1996457 55M30 (22E20 57N60) Iwase, Norio; Mimura, Mamoru; Nishimoto, Tetsu On the cellular decomposition and the Lusternik-Schnirelmann category of $\rm Spin(7)$$\rm Spin(7)$. Topology Appl. 133 (2003), no. 1, 1–14. Article

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