00611naa#a2200169#i#450# EN\\bibl\119706 20260408203539.3 2221-3260 20260228b2026####ek#y0engy0150####ca RU The use of the Business Confidence Index (IPI) to analyze the dynamics of the development of the Russian ferrous metallurgy in the global market Journal article Yaroslavl Yaroslavl State Technical University 2026 11 с. Journal article local Kon'kov Maksim Nikolaevich Noskov Vladimir Anatol'evich chemintech.ru