Towards a sustainable approach of energy policy in the EU: empirical evidence for Romania vs. the Visegrad Group based on the relationship among disruptive technology, knowledge and final energy consumption - Burciu, Aurel; Bostan, Ionel; Kicsi, Rozalia; Buta, Simona; Zoltan, Raluca; Condratov, Iulian (Frontiers in Energy Research, 2025)