ECE/TRANS/WP.29/GRSP/46, para. 4, ECE/TRANS/WP.29/GRSP/2009/2, ECE/TRANS/WP.29/GRSP/2008/3, ECE/TRANS/WP.29/GRSP/2008/4, ECE/TRANS/WP.29/GRSP/2008/20, (ECE/TRANS/WP.29/AC.3/18)
Documentation: ECE/TRANS/WP.29/GRSP/46, par. 4; ECE/TRANS/WP.29/GRSP/2009/2; ECE/TRANS/WP.29/GRSP/2008/3, ECE/TRANS/WP.29/GRSP/2008/4, ECE/TRANS/WP.29/GRSP/2008/20; ECE/TRANS/WP.29/AC.3/18.