Energetics of Buchdahl stars and the magnetic Penrose process Sanjar Shaymatov, Naresh Dadhich and Arman Tursunov Eur. Phys. J. C, 84 10 (2024) 1015 Published online: 07 October 2024 DOI: 10.1140/epjc/s10052-024-13419-9