     'pert_faster', {1, 'M', [0, 1]}, ...   % use the last known negative curvature vector to determine perturbation
%       ... % solve_simple_chol.m
%       'chol_ordering', {1, 'M', [0, 1]}, ... % use symamd for sparse matrices before Cholesky factor.?
%       ... % solvers
%       'luk3_diag', {1., 'R', [0, Inf]} ...  % diagonal of the (2,2)-block in Luksan 3 preconditioner
%     );
%
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%% Appendix 3, Definition of BMI input format
%
