Identification of CO2 and O2 emissions dynamics in a natural gas furnace through flame images, ARMAX models, and Kalman filtering - Silva Neto, Gustavo Cunha da Silva; Chui, Danilo de Santana; Martins, Flavius Portella Ribas; Fleury, Agenor de Toledo; Furnari, Fausto (Journal of the Brazilian Society of Mechanical Sciences and Engineering, 2021)