TY JOUR TI Double supermassive black holes as possible sources of powerful gravitational wave radiation KW gravitational waves KW AGN KW black holes KW radio emission JO Infocommunications and Radio Technologies AU Volvach, A.. AU Larionov, M.G. AU Volvach, L.. AU Aller, H.D. AU Aller, M.F. PY 2020 IS 3 PB Federal State Educational Institution of Higher Education Sevastopol State University