Estimates for the Nash-Sofer Preconditioner for the Reduced Hessian for Some Elliptic Variational Inequalities.

T. D. Choi Carl T. Kelley Estimates for the Nash-Sofer Preconditioner for the Reduced Hessian for Some Elliptic Variational Inequalities. 327-341 1999 9 SIAM J. Optim. 2 https://doi.org/10.1137/S1052623497323364 db/journals/siamjo/siamjo9.html#ChoiK99