TY JOUR TI PRINCIPLES OF CLOSED-LOOP ECONOMY IN THE LEGISLATION OF DEVELOPED EUROPEAN COUNTRIES KW closed-loop economy KW cyclical economy KW waste KW secondary resources KW European Union KW Sweden KW Finland KW Germany KW France KW United Kingdom JO Actual directions of scientific researches of the XXI century: theory and practice AU Dolgushin, A.B. PY 2023 IS 11 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov