. . "Dioxins Environmental aspects." . . "Dioxins Toxicology." . . "Furans Environmental aspects." . . . . . "Dioxins and furans : unintentional by-products of chlorine base activities"@en . . "Dioxins and Furans : Unintentional By-products of Chlorine Base Activities" . . "Dioxins and Furans: Unintentional By-products of Chlorine Base Activities"@es . . . . . . . . . . "Dioxins." . . "Furans Toxicology." . . "Furans." . . "Air Pollution Prevention." . .