TY JOUR TI Theoretical and practical aspects of the implementation of the principles of closed-cycle economics KW economic model KW resource theory KW secondary material reĀ­sources KW economic KW social KW environmental analysis KW involvement of producĀ­tion and consumption waste in recycling JO The Economy under Guard AU Titov, V.A. AU Morozov, O.L. PY 2019 IS 2019 PB Nizhny Novgorod Academy of the Ministry of the Interior of Russia