1. Atiyah, M.F., Bott, R., Shapiro, A.: Clifford modules. Topology 3(1), 3–38 (1964)
2. Baez, J.C.: The octonions. Bull. Am. Math. Soc. 39(2), 145–205 (2002)
3. Berline, N., Getzler, E., Vergne, M.: Heat Kernels and Dirac Operators. Grundlehren der mathematischen Wissenschaften, vol. 298. Springer, Berlin (1992)
4. Brackx, F., Delanghe, R., Sommen, F.: Clifford Analysis Research Notes in Mathematics, vol. 76. Pitman (Advanced Publishing Program), Boston (1982)
5. Brackx, F., De Schepper, H.: The Hilbert transform on a smooth closed hypersurface. Cubo 10(2), 83–106 (2008)