@article{lstrs2008,
    author = "Marielba Rojas and Sandra A. Santos and Danny C. Sorensen",
    title  = "{Algorithm 873: LSTRS: MATLAB software for large-scale trust-region subproblems and regularization}",
    journal = "ACM Trans. Math. Software",
    volume  = 34,
    number  = 2,
    pages  = "11",
    year    = 2008
}