MR2544061 Ludkovsky, S. V. Algebras of operators in Banach spaces over the quaternion skew field and the octonion algebra. J. Math. Sci. (N. Y.) 144 (2007), no. 4, 4301–4366; translated from Sovrem. Mat. Prilozh. No. 35 (2005), 98--162(Russian) (Reviewer: Camillo Trapani)