  | Miljøprojekt Nr. 456, 1999 (Danish Environmental Protection Agency): "Erstatning
        af kraftige drivhusgasser" (Substitution of potent greenhouse gases). Per Henrik
        Pedersen, Danish Technological Institute. | 
        | Tema Nord 2000:552 (Nordic Council of Ministers): "Ways of reducing consumption and
        emission of potent greenhouse gases". Per Henrik Pedersen, Danish Technological
        Institute. | 
        | Arbejdsrapport nr. 580, 2001: "Ozonlagsnedbrydende stoffer og drivhusgasserne
        HFCer, PFCer og SF6  1999" (Ozone depleting substances
        and the greenhouse gases HFCs, PFCs and SF6  1999). Thomas Sander
        Poulsen, COWI. | 
        | Environmental Project No. 300: "Polyurethane Foam without Ozone Depleting
        Substances; Experience from Danish Industry". Danish Environmental Protection Agency,
        1995. | 
        | Environmental Project No. 301: "Going towards Natural Refrigerants; Experience from
        Danish Industry". Danish Environmental Protection Agency, 1995. | 
        | Environmental Project No. 312: "Going towards Natural Fire Extinguishants;
        Experience from Danish Industry". | 
        | Scandinavian Refrigeration (Scan Ref) 4/1997. Article on Swedish supermarket
        refrigeration system using hydrocarbons as refrigerant. | 
        | Kathryn Ellerton, Allied Signal Inc: "Recent Developments and the Outlook for
        Global Sulfur Hexafluoride", International Magnesium Association Fifty Four, Toronto,
        June 1997. | 
        | Letter from Sarah Severn, Director, NIKE Environmental Action Team to Tarjei Haaland,
        Greenpeace Denmark. Dated 12 September 1997. | 
        | Environmental Report, Norsk Hydro, 1997. | 
        | Letter from Hannah Johnes, Director of Corporate Responsibility, Nike Europe, Middle
        East and Africa to Tarjei Haaland, Greenpeace Denmark. Dated 6 September 2001. | 
        | Brochures from Danish and foreign companies. |