1. Developers guidline to implement E-ID in future applications: https://eid.egiz.gv.at/secure/?page_id=259#signatur
2. The Austrian E-ID approach: https://eid.egiz.gv.at/secure/
3. MITA on eIDAS Regulation in Malta: https://www.mita.gov.mt/en/ict-features/Pages/2017/MITA-and-Identity-Malta-compliant-with-the-ET//SI-standard-on-electronic-signatures-and-infrastructures.aspx
4. Cryptomathic.com explaining the eIDAS regulation: https://www.cryptomathic.com/news-events/blog/qualified-electronic-signatures-for-eidas
5. Regulation (EU) No 910/2014 of the European Parliament and of the Council of 23 July 2014 on electronic identification and trust services for electronic transactions in the internal market and repealing Directive 1999/93/EC: https://eur-lex.europa.eu/legal-content/EN/TXT/?uri=uriserv:OJ.L_.2014.257.01.0073.01.ENG