Richard J. Hanson. Aasen's method for linear systems with self-adjoint matrices. Visual Numerics, Inc., http://www.vni.com/books/whitepapers/Aasen. html, July 1997.

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Notes on Accuracy and Stability of Algorithms in Numerical Linear .. - Higham (1998)   (Correct)

....compared with the corresponding bounds of 16 and 64. 3.3. Aasen s Method Versus Block LDL While block LDL of a symmetric matrix using the BK pivoting strategy is implemented in all the major program libraries, the only library we know to contain Aasen s method is the IMSL Fortran 90 library [28]. A comparison of the two methods in the mid 1970s found little to choose between them in speed [7] but no thorough comparison on modern computer architectures has been published. See [4] for some further comments. The greater popularity of block LDL factorization may be due to the fact that ....

Richard J. Hanson. Aasen's method for linear systems with self-adjoint matrices. Visual Numerics, Inc., http://www.vni.com/books/whitepapers/Aasen. html, July 1997.

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