@misc{Kiwiel_Krzysztof_An_2009,
 author={Kiwiel, Krzysztof},
 copyright={Creative Commons Attribution BY 4.0 license},
 address={Warszawa},
 journal={Raport Badawczy = Research Report},
 howpublished={online},
 year={2009},
 publisher={Instytut Badań Systemowych. Polska Akademia Nauk},
 publisher={Systems Research Institute. Polish Academy of Sciences},
 language={eng},
 abstract={The article deals with generalization of the non-derivative discrete gradient method of Bagirov et al. for minimizing a locally Lipschitz function f on Rn . The existing convergence result for this method has been strengthened by showing that it either drives the f -values to -∞ or each of its cluster points is Clarke stationary for f, without requir­ing compactness of the level sets of f. This generalization is an approximate bundle method, which also subsumes the secant method of Bagirov et al.},
 title={An improved convergence result for the discrete gradient and secant methods for nonsmooth optimization.},
 type={Text},
 URL={http://www.rcin.org.pl/Content/144827/PDF/RB-2009-38.pdf},
 keywords={Nonsmooth optimization, Bundle methods, Optymalizacja niegładka, Optymalizacja bez pochodnych, Gradient dyskretny, Derivative-free optimization, Discrete gradient},
}