Geosynthetic barriers – Test method for determining the resistance to roots; German version CEN/TS 14416:2005
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 01/01/2006

Geosynthetic barriers – Test method for determining the resistance to roots; German version CEN/TS 14416:2014
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 05/01/2014