10 Jan 2011	Draft agenda for the 4th HDH informal group session	HDH-04-01	2011-01-10
11 Feb 2011	Progress report of the informal group on heavy-duty hybrids	HDH-04-02	2011-02-11
11 Feb 2011	Release of HILS Open source model for HD Hybrid Vehicle using rigid model (Japan)	HDH-04-03	2011-02-11
11 Feb 2011	Feasibility study for Chassis dynamometer based Emission testing procedure as an alternative to HILS for Heavy Duty Hybrid Electric Vehicles (India)	HDH-04-04	2011-02-11
3 Mar 2011	Chairman's report to GRPE on HD Hybrid Informal Group work	HDH-04-05	2011-03-03
3 Mar 2011	Minutes of the 4th HDH informal group session	HDH-04-06	2011-03-03