@article{rss2000,
    author = "Marielba Rojas and Sandra A. Santos and Danny C. Sorensen",
    title  = "A new matrix-free algorithm for the large-scale trust-region subproblem",
    journal = "SIAM J. Optim.",
    volume  = 11,
    number  = 3,
    pages   = "611-646",
    year    = 2000
}