Demin, D. 2018. Investigation of structural cast iron hardness for castings of automobile industry on the basis of construction and analysis of regression equation in the factor space «carbon (C) - carbon equivalent (Ceq)». Technology audit and production reserves. 3, 1(41) (Jan. 2018), 29–36. DOI:https://doi.org/10.15587/2312-8372.2018.109097.