| HDH-04-06 - (HDH Secretary) - Minutes of the fourth meeting of the GRPE informal group on Heavy Duty Hybrids (HDH) |
| HDH-04-05 - (HDH Chair) - HD Hybrids informal group: Chairman's view |
| HDH-04-04 - (India) - Feasibility study for a chassis dynamometer based emission test procedure as an alternative test procedure to HILS for Heavy Duty Hybrid Electric Vehicles (HD-HEV) |
| HDH-04-03 - (Japan) - Open source model for HILS test procedure |
| HDH-04-02 - (HDH Secretary) - Progress report of the informal group on Heavy Duty Hybrids (HDH) |
