F. C. Figueiredo, L. M. S. A. Borges, LIMIT ANALYSIS ON SCRATCH TEST PROBLEM, Blucher Mechanical Engineering Proceedings, Volume 1, 2014, Pages 1929-1944, ISSN 23580828, http://dx.doi.org/10.5151/meceng-wccm2012-18593 (www.proceedings.blucher.com.br/article-details/limit-analysis-on-scratch-test-problem-9135) Palavras-chave:: ;