BUTTREY, S. E. Calling the lp_solve Linear Program Software from R, S-PLUS and Excel. Journal of Statistical Software, [S. l.], v. 14, n. 4, p. 1–13, 2005. DOI: 10.18637/jss.v014.i04. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v014i04. Acesso em: 28 apr. 2024.