"Zelinka, Bohdan" . . "A remark on graph operators." . "24510" . "124" . "A remark on graph operators." . "734154" . . "A remark on graph operators."@en . "Zelinka, Bohdan" . "[46843D076E10]" . "1"^^ . "A remark on graph operators."@en . "124" . "CZ - \u010Cesk\u00E1 republika" . "RIV/46747885:24510/99:00000073" . "A remark on graph operators." . . "83" . . . . "A remark on graph operators."@en . "Z(MSM 245100302)" . . "3"^^ . . . "1"^^ . "Mathematica Bohemica" . "RIV/46747885:24510/99:00000073!RIV/2000/MSM/245100" . . . "0862-7959" .