@article{articlec78e7a55,
title   = {Management model PDCA 90-10 applied to open pit mine operations: practical example: Phosphate mine at Araxá, MG-Brasil},
author = {Agra, Richardson Viana and Petta, Afonso Heraldo and Paulino, Jonas R and De Tomi, Giorgio Francesco Cesare},
year = {2014},
doi = {10.4028/www.scientific.net/MSF.805.448},
journal   = {Materials Science Forum}
}