TY JOUR TI CHOICE OF OPTIMAL LEVELS OF GRAVITATION IN SOCIAL AND ECONOMIC SYSTEMS BASED ON THE PRINCIPLES OF GRAVITATION KW principle of gravity KW set level of development KW average number of subjects KW formalized model KW optimization problem KW developed parameters KW controlled levels of development JO Vestnik of Astrakhan State Technical University. Series: Management, computer science and informatics AU Popov, G.. AU Popova, E.. PY 2016 IS 2016 PB Astrakhan State Technical University