Clifford modules

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Atiyah, 1959, Riemann-Roch theorems for differentiable manifolds, Bull. Amer. Math. Soc., 65, 276, 10.1090/S0002-9904-1959-10344-X

Atiyah, 1961, Vector bundles and homogeneous spaces, Proceedings of Symposia of the American Mathematical Society, Vol. III, 10.1090/pspum/003/0139181

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Bott, 1959, The stable homotopy of the classical groups, Ann. Math., Princeton, 70, 313, 10.2307/1970106

Bott, 1959, Quelques remarques sur les théorèmes de periodicité, Bull. Soc. Math. Fr., 87, 293, 10.24033/bsmf.1526

Bott, 1962