Magnetic nanocatalysts of 'NI' IND. 0.5''ZN' IND. 0.5''FE' IND. 2''O IND. 4' doped with 'CU' and performance evaluation in transesterification reaction for biodiesel production - Dantas, J.; Leal, E.; Costa, A. C. F. M.; Mapossa, A. B.; Cornejo, Daniel Reinaldo (FUEL, 2017)