Fix some duplicated references

<span id="_ref_i.17"></span><a name="_ref_i.17">[i.17]</a> "prEN 40000-1-3": "Cybersecurity requirements for products with digital elements – Vulnerability Handling " [Version and date to be added upon its publication by CEN CENELEC]

<span id="_ref_i.18"></span><a name="_ref_i.18">[i.17]</a> "IETF RC 5280": "Intelligent Transport Systems (ITS); Security; Security header and certificate formats; Release 2" 

<span id="_ref_i.18"></span><a name="_ref_i.18">[i.18]</a> "IETF RC 5280": "Intelligent Transport Systems (ITS); Security; Security header and certificate formats; Release 2" 

<span id="_ref_i.19"></span><a name="_ref_i.19">[i.17]</a> "ETSI TS 103 097": " Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile " 

<span id="_ref_i.19"></span><a name="_ref_i.19">[i.19]</a> "ETSI TS 103 097": " Internet X.509 Public Key Infrastructure Certificate and Certificate Revocation List (CRL) Profile " 

<span id="_ref_i.19"></span><a name="_ref_i.19">[i.17]</a> "Directive (EU) 2023/2661 of the European Parliament and of the Council of 22 November 2023 amending Directive 2010/40/EU": " on the framework for the deployment of Intelligent Transport Systems in the field of road transport and for interfaces with other modes of transport " 

<span id="_ref_i.20"></span><a name="_ref_i.19">[i.20]</a> "Directive (EU) 2023/2661 of the European Parliament and of the Council of 22 November 2023 amending Directive 2010/40/EU": " on the framework for the deployment of Intelligent Transport Systems in the field of road transport and for interfaces with other modes of transport " 

# 3 Definition of terms, symbols and abbreviations