Xie, Xiao-Feng; Wang, Zun-Jing (2018). "SIV-DSS: Smart in-vehicle decision support system for driving at signalized intersections with V2I communication". Transportation Research Part C. 90: 181–197. doi:10.1016/j.trc.2018.03.008.
Here the 2014 version: Electromagnetic compatibility and Radio spectrum Matters (ERM); System Reference document (SRdoc); Technical characteristics for pan European harmonized communications equipment operating in the 5,855 GHz to 5,925 GHz range intended for road safety and traffic management, and for non-safety related ITS applications (http://www.etsi.org/deliver/etsi_tr/103000_103099/103083/01.01.01_60/tr_103083v010101p.pdf)
Federal Communications Commission -Amendment of Parts 2 and 90 of the Commission's Rules to Allocate the 5.850-5.925 GHz Band to the Mobile Service for Dedicated Short Range Communications of Intelligent Transportation Services ET Docket No. 98-95 (https://apps.fcc.gov/edocs_public/attachmatch/FCC-99-305A1.doc)