1. International association for natural gas vehicles, (last accessed 19.01.13).
2. FMVSS No. 304. Fuel system integrity compressed natural gas containers. National highway traffic safety administration, 49 CFR 571.304, 1994, 2000, 2002.
3. ANSI NGV2-2000. Basic requirements for compressed natural gas vehicle fuel containers, 2000.
4. DOT TP304-03. Laboratory test procedure for FMVSS 304 compressed natural gas (CNG) fuel container integrity. DOT office of vehicle safety compliance, 2003.
5. ISO 11439. Gas cylinders – high pressure cylinders for the on-board storage of natural gas as a fuel for automotive vehicles, 2000. .