TY CONF TI ON ONE OVERDETERMINED SYSTEM OF PARTIAL DERIVATIVE EQUATIONS WITH COMPLEX PERIODIC COEFFICIENTS KW overdetermined systems KW partial differential equations KW general solution KW bounded solution KW periodic solution JO OPERATOR EQUATIONS AND SOME RELATED ISSUES IN APPLIED MATHEMATICS AU Jumaev, B.M. PY 2026 PB FSBE Institution of Higher Education Voronezh State University of Forestry and Technologies named after G.F. Morozov