Faizabadi, M., G. Khalaj, H. Pouraliakbar, and M. Jandaghi. “Predictions of Hardness and Impact Toughness Using Chemical Composition and Tensile Characteristics Measurements in Microalloyed API X70 Pipeline Steels”. Journal of Mining and Metallurgy, Section B: Metallurgy, Vol. 51, no. 2, Nov. 2015, pp. 173-8, https://aseestant.ceon.rs/index.php/jmm/article/view/6143.