| GRSG-104-21 | Proposal for amendments to Regulation No. 121 | |
| GRSG-105-21 | Proposal for amendments to Regulation No. 121 | |
| GRSG-105-30 | Proposal for amendments to document WP.29/2012/30 concerning Regulation No. 121 | |
| GRSG/84 | Report of the GRSG on its 105th session | |
| WP.29/2012/30 | Proposal for the 01 series of amendments to Regulation No. 121 |