ETSI EN 302 663 V1.2.1 (2013-07) Intelligent Transport Systems (ITS); Access layer specification for Intelligent Transport Systems operating in the 5 GHz frequency band
ETSI ES 202 663 V1.1.0 (2010-01) Intelligent Transport Systems (ITS); European profile standard for the physical and medium access control layer of Intelligent Transport Systems operating in the 5 GHz frequency band