Camioto, Flávia, Enzo Mariano, and Daisy Rebelatto. “Sustainability Improvement Opportunities in Brazilian Sectors: Analysis of DEA Slacks”. Brazilian Journal of Operations & Production Management 14, no. 3 (September 6, 2017): 363-370. Accessed June 25, 2019. https://bjopm.emnuvens.com.br/bjopm/article/view/356.