"We show some possibilities of using the method of the color indices for analysis of optical counterparts of high energy sources. We focus on the types of objects for which this method is only rarely used. We show that these indices are very helpful in forming a representative ensemble of events."@en . "1" . "3"^^ . . . "\u0160imon, Vojt\u011Bch" . . "6"^^ . . "RIV/67985815:_____/10:00355225" . "2"^^ . . . "Memorie della Societa Astronomica Italiana" . . . . . "IT - Italsk\u00E1 republika" . . . "We show some possibilities of using the method of the color indices for analysis of optical counterparts of high energy sources. We focus on the types of objects for which this method is only rarely used. We show that these indices are very helpful in forming a representative ensemble of events." . "[BE1E97A6DFB6]" . "Hudec, Ren\u00E9" . "Color-color analysis of the optical counterparts of high energy sources"@en . "X-rays binaries; gamma rays; accretion, accretion disks"@en . . "Color-color analysis of the optical counterparts of high energy sources" . "Pizzichini, G." . . "P(GA205/08/1207), Z(AV0Z10030501)" . "251180" . "Color-color analysis of the optical counterparts of high energy sources" . . . "0037-8720" . . "RIV/67985815:_____/10:00355225!RIV11-GA0-67985815" . "81" . "Color-color analysis of the optical counterparts of high energy sources"@en . . .