Quasi-Newton updates with weighted secant equations

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A derivative-free trust-funnel method for equality-constrained nonlinear optimization
Rodrigues Sampaio, P. & Toint, P. L., 1 May 2015, In: Computational Optimization and Applications. 61, 1, p. 25-49 25 p.
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Approximate invariant subspaces and quasi-Newton optimization methods
Gratton, S. & Toint, P. L., 1 Aug 2010, In: Optimization Methods and Software. 25, 4, p. 507-529 23 p.
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Approximating Hessians in unconstrained optimization arising from discretized problems
Malmedy, V. & Toint, P., 1 Sept 2011, In: Computational Optimization and Applications. 50, 1, p. 1-22 22 p.
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Using approximate secant equations in limited memory methods for multilevel unconstrained optimization
Gratton, S., Malmedy, V. & Toint, P., 1 Apr 2012, In: Computational Optimization and Applications. 51, 3, p. 967-979 13 p.
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