10 January 2011 Minutes of the 3rd HDH informal group session HDH-03-10	HDH-03-10	2011-01-10
10 January 2011 Draft agenda for the 4th HDH informal group session HDH-04-01	HDH-04-01	2011-01-10
11 January 2011 Status Report of the GRPE Informal Group on Heavy-Duty Hybrids GRPE-61-16	GRPE-61-16	2011-01-11
11 January 2011 HDH secretary's report to GRPE on heavy-duty hybrids work GRPE-61-17	GRPE-61-17	2011-01-11
11 February 2011 Progress report of the informal group on heavy-duty hybrids HDH-04-02	HDH-04-02	2011-02-11
11 February 2011 Release of HILS Open source model for HD Hybrid Vehicle using rigid model (Japan) HDH-04-03	HDH-04-03	2011-02-11
11 February 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	HDH-04-04	2011-02-11
3 March 2011 Revised minutes of the 3rd HDH informal group session HDH-03-10/Rev.1	HDH-03-10/Rev.1	2011-03-03
3 March 2011 Chairman's report to GRPE on HD Hybrid Informal Group work HDH-04-05	HDH-04-05	2011-03-03
3 March 2011 Minutes of the 4th HDH informal group session HDH-04-06	HDH-04-06	2011-03-03
28 March 2011 Proposal for Corrigendum 1 to Amendment 1 to global technical regulation No. 4 (OICA) GRPE/2011/9	GRPE/2011/9	2011-03-28
2 September 2011 Proposal for Corrigendum 1 to Amendment 1 to global technical regulation No. 4 WP.29/2011/142	WP.29/2011/142	2011-09-02
15 November 2011 Form for the voting on global technical regulations (1998 Agreement) at WP.29-155 WP.29-155-28	WP.29-155-28	2011-11-15