1. EASA. European Union Aviation Safety Agency (EASA) Concept Paper: First usable guidance for Level 1 machine learning applications. https://www.easa.europa.eu/en/downloads/134357/en (2021)
2. EN 50126-1:2018-10. Railway Applications – The Specification and Demonstration of Reliability, Availability, Maintainability and Safety (RAMS) - Part 1: Generic RAMS Process (2018)
3. EN 50128:2012-02. Railway Applications – Communication, signaling and processing systems – Software for railway control and protection systems (2012)
4. EN 50129:2019-06. Railway application – Communications, signaling and processing systems – Safety related electronic systems for signaling (2019)
5. EN 50657:2017-11. Railways Applications - Rolling stock applications - Software on Board Rolling Stock (2017)