PINERES-MENDOZA, Jorge L.; BARRAZA-BURGOS, Juan M.  and  BELLICH-FERNANDEZ, Silvia P.. Effect of Diesel Oil and Mixture of Alcohol-Glycol Ether on Colombian Ultrafine Coal Cleaning Using a Test-Rig Closed-Loop Flotation Column. Ing. Investig. [online]. 2022, vol.42, n.1.  Epub Oct 25, 2021. ISSN 0120-5609.