First post-Newtonian N-body problem in Einstein–Cartan theory with the Weyssenhoff fluid: Lagrangian and first integralsEmmanuele Battista, Vittorio De Falco and Davide UsseglioEur. Phys. J. C, 83 2 (2023) 112DOI: https://doi.org/10.1140/epjc/s10052-023-11249-9