1. A. G. Kurosh, ?Free sums of multioperator algebras,? Sib. Mat. Zh., No. 1, 62?70 (1960).
2. A. G. Kurosh, ?Multioperator rings and algebras,? Usp. Mat. Nauk,24, No. 1, 3?15 (1969).
3. T. M. Baranovich and M. S. Burgin, ?Linear ?-algebras,? Usp. Mat. Nauk,30, No. 4, 61?106 (1975).
4. B. A. Rozenfel'd, Spaces of Higher Dimensions [in Russian], Nauka, Moscow (1966).
5. N. V. Efimov and E. R. Rozenforn, Linear Algebra and Multidimensional Geometry [in Russian], Nauka, Moscow (1974).