ACM - Normas
Jennifer B. Erway
Roummel F. Marcia
ACM Transactions on Mathematical Software
Shifted L-BFGS systems
Limited-memory BFGS systems with diagonal updates
Solving the Trust-Region Subproblem using the Lanczos Method
CUTEr and SifDec
On the limited memory BFGS method for large scale optimization
A modified nearly exact method for solving low-rank trust region subproblem