Wastewater treatment plants – Principles for the design of structures and technical equipment – Part 2: Specific principles for the equipment for separating and thickening of solids
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 12/01/2002

Wastewater treatment plants – Principles for the design of structures and technical equipment – Part 2: Specific principles for the equipment for separating and thickening of solids (without facilities for separation and treatment of sand)
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 09/01/2017