Gravitational field on the Lorentz tangent bundle: generalized paths and field equations A. Triantafyllopoulos, E. Kapsabelis and P. C. Stavrinos Eur. Phys. J. Plus, 135 7 (2020) 557 Published online: 10 July 2020 DOI: 10.1140/epjp/s13360-020-00570-x