Hybrid Energy Storage Systems Based on Redox-Flow Batteries: Recent Developments, Challenges, and Future Perspectives In English Schubert, Christina; Hassen, Wiem Fekih; Poisl, Barbara; Seitz, Stephanie; Schubert, Jonathan; Usabiaga, Estanis Oyarbide; Molina Gaudo, Pilar; Pettinger, Karl-Heinz. 2023. Hybrid Energy Storage Systems Based on Redox-Flow Batteries: Recent Developments, Challenges, and Future Perspectives. BATTERIES. 9-4, pp.211 [29 pp.]. ISSN 2313-0105. Open Access article, you can download it here https://www.mdpi.com/2313-0105/9/4/211