Huang, X., X. Lv, C. Bai, R. Zhang, and M. Zhou. “Contact Angle of Iron Ore Fines: Measurement and Analysis”. Journal of Mining and Metallurgy, Section B: Metallurgy, Vol. 51, no. 1, Jan. 2015, p. 33, https://aseestant.ceon.rs/index.php/jmm/article/view/6663.