Castillo, A. F. L., Lawrynowicz, J., & Suzuki, O. (2008). Basic properties and applications of graded fractal bundles related to Clifford structures: An introduction. Ukrains’kyi Matematychnyi Zhurnal, 60(5), 603–618. Retrieved from https://umj.imath.kiev.ua/index.php/umj/article/view/3179