Camioto, F. de C., E. B. Mariano, and D. A. do N. Rebelatto. “Sustainability Improvement Opportunities in Brazilian Sectors: Analysis of DEA Slacks”. Brazilian Journal of Operations & Production Management, vol. 14, no. 3, Sept. 2017, pp. 363-70, doi:10.14488/BJOPM.2017.v14.n3.a9.