This text provides a list of 25 references related to the topics of hydrogen production and purification, as well as power-to-gas technology. The references include scientific articles, conference proceedings, and other sources that provide information on various methods and technologies used in hydrogen production and purification, as well as the potential for power-to-gas integration.Some of the key topics covered in these references include:1. Hydrogen production through electrolysis, steam methane reforming, and bio-resources.2. Hydrogen purification using various methods such as adsorption, membrane, cryogenic distillation, and ion exchange.3. Power-to-gas technology, including its potential for grid integration and impact on energy systems.4. The use of power-to-X converters in a decarbonized energy system.5. The opportunities and challenges associated with power-to-gas integration into the grid.6. Hydrogen production from renewable energy sources, such as solar and wind power.7. The efficiency of various hydrogen production methods and their potential for large-scale implementation.8. The use of solvent-based methods for hydrogen purification.9. The potential for power-to-gas integration in a hybrid energy system.10. Hydrogen production from biomass gasification and its efficiency compared to other methods.These references provide a comprehensive overview of the latest research and developments in the field of hydrogen production and purification, as well as power-to-gas technology. They highlight the potential benefits and challenges associated with these technologies and their applications in various energy systems.