Almamoury, Q. A. (2026). Ultra-Efficient Hybrid Propulsion System Integrating Stirling Engines and PEM Fuel Cells: Thermodynamic Feasibility and Techno-Economic Assessment. Vital Annex: International Journal of Novel Research in Advanced Sciences (2751-756X), 5(3), 159–165. Retrieved from https://journals.innoscie.com/index.php/ijnras/article/view/381