Building hardware – Controlled door closing devices – Part 4: Automatic swing door operator with self-closing function
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 04/01/2015

Building hardware – Controlled door closing devices – Part 4: Automatic swing-door operator
standard by Deutsches Institut Fur Normung E.V. (German National Standard), 05/01/1997