TY CONF TI PRODUCTION FUNCTION OF KOBB-DOUGLAS KW production function KW production KW costs KW efficiency KW output KW resources KW capital KW work KW elasticity KW usefulness JO Mathematics in Economics AU Konozova, A.V. AU Sinditskaya, E.A. AU Shatirishvili, M.M. PY 2020 PB AUS PUBLISHERS