TY JOUR TI Optimal control problems for elliptic equations with control in the coefficients KW optimal control KW elliptic equation KW correct the problem KW the optimality condition JO Actual directions of scientific researches of the XXI century: theory and practice AU Kasymova, R.. PY 2014 IS 2 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov