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4. W. N. Anderson, T. D. Morley, and G. E. Trapp, The Cascade Limit, the Shorted Operator and Quadratic Optimal Control, inLinear Circuits, Systems and Signal Processing: Theory and Application, ed. by Christopher I. Byrnes, Clyde F. Martin, and Richard Saeks, North-Holland, New York, 1988, pp. 3?7.
5. W. N. Anderson, D. F. Reynolds, and G. E. Trapp, Cascade Addition of Matrices,Proc. West Virginia Acad. Sci.,46 (1974), 185?192.