S. Thode Filho, M. F. M. de Sena, E. R. da Silva, G. B. Cabral, and F. da S. Maranhão, “STOICHIOMETRIC ANALYSIS SYSTEM FOR PRODUCTION OF SOAP FROM VEGETABLE OIL RESIDUAL: A STRATEGY FOR REDUCING ENVIRONMENTAL IMPACT”, REGET, vol. 15, no. 15, pp. 3019–3025, Oct. 2013.