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    ".. [1] A.R. Conn, N.I. Gould, and P.L. Toint, \"Trust region methods\",",
    "       Siam, pp. 169-200, 2000.",
    ".. [2] J. Nocedal and  S. Wright, \"Numerical optimization\",",
    "       Springer Science & Business Media. pp. 83-91, 2006.",
    ".. [3] J.J. More and D.C. Sorensen, \"Computing a trust region step\",",
    "       SIAM Journal on Scientific and Statistical Computing, vol. 4(3),",
    "       pp. 553-572, 1983."
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