| GFV-34-02 | Progress report on the GFV heavy-duty dual-fuel systems activity | |
| GFV-29-03 | Retrofit versus conversion (definitions) | |
| GFV-33-02 | Heavy-duty dual fuel systems regulation: Open issues list as of 3 April 2014 | |
| GFV-33-06 | Heavy-duty retrofit dual fuel systems: Working draft text of the proposed regulation |