| Download: WP.29/1167 | from UNECE: | .pdf format | .docx format |
| Download: WP.29/1167/Add.1 | from UNECE: | .pdf format | .docx format |
| Download: WP.29/1167/Add.2 | from UNECE: | .pdf format | .docx format |
| 19.9. | UN GTR No. 23 on durability of after treatment devices for two- and three-wheeled motor vehicles |