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3. Partial pivoting strategies for symmetric matrices;Bunch, James R.;SIAM J. Numer. Anal.,1974
4. J. R. BUNCH & L. KAUFMAN, "Some stable methods for calculating inertia and solving symmetric linear systems," Univ. of Colorado Tech. Report 63, CU:CS:06375.
5. Direct methods for solving symmetric indefinite systems of linear equations;Bunch, J. R.;SIAM J. Numer. Anal.,1971