Kim, D.C., et al. “A New Iron-Nanofluid As Fuel Additive for Particulate Matter Reduction in Heavy Fuel Oil-Fired Boiler Facility”. Asian Journal of Chemistry, vol. 20, no. 7, Mar. 2010, pp. 5767-75, https://asianpubs.org/index.php/ajchem/article/view/12921.