D. N. Wilke, S. Kok, NUMERICAL SENSITIVITY COMPUTATION FOR DISCONTINUOUS GRADIENT-ONLY OPTIMIZATION PROBLEMS USING THE COMPLEX-STEP METHOD, Blucher Mechanical Engineering Proceedings, Volume 1, 2014, Pages 3665-3676, ISSN 23580828, http://dx.doi.org/10.5151/meceng-wccm2012-19508 (www.proceedings.blucher.com.br/article-details/numerical-sensitivity-computation-for-discontinuous-gradient-only-optimization-problems-using-the-complex-step-method-9263) Palavras-chave:: ;