P. B. Zarante, M. J. da Silva, O. S. Valente, and J. R. Sodré, “ALDEHYDE EMISSIONS FROM A STATIONARY DIESEL ENGINE OPERATING WITH CASTOR OIL BIODIESEL – DIESEL OIL BLENDS”, RETERM, vol. 9, no. 1-2, pp. 35–39, Dec. 2010.