“Joint Processing of V-Bearing Steelmaking Slag and V-Bearing Black Shale for Vanadium and Iron Separation”. Journal of Mining and Metallurgy, Section B: Metallurgy, vol. 57, no. 2, July 2021, pp. 217-23, https://test.aseestant.ceon.rs/index.php/jmm/article/view/24647.