Food hygiene – Display cabinets – Part 4: Thermal display cabinets for hot foodstuffs; Hygiene requirements, testing
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 01/01/2004

Food hygiene – Display cabinets – Part 4: Thermal display cabinets for hot foodstuffs – Hygiene requirements, testing
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 12/01/2011