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This paper describes an algorithm for reducing a real matrix A to block diagonal form by a real similarity transformation. The columns of the transformation corresponding to a block span a reducing ...
Louis Bauer, Edward L. Reiss, Block Five Diagonal Matrices and the Fast Numerical Solution of the Biharmonic Equation, Mathematics of Computation, Vol. 26, No. 118 (Apr., 1972), pp. 311-326 ...