TY JOUR TI A concept for creating a ferrous metallurgy eco-cluster with a carbon market on a blockchain KW eco-cluster KW ferrous metallurgy KW carbon market KW blockchain KW Verhulst model KW climate policy KW carbon intensity JO Journal of Applied Research AU Shadrina, E.V. AU Yashalova, N.N. PY 2026 IS 0 PB ITBO University