NASH, J. C.; VARADHAN, R. Unifying Optimization Algorithms to Aid Software System Users: optimx for R. Journal of Statistical Software, [S. l.], v. 43, n. 9, p. 1–14, 2011. DOI: 10.18637/jss.v043.i09. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v043i09. Acesso em: 4 dec. 2021.