Spin, torsion and violation of null energy condition in traversable wormholesElisabetta Di Grezia, Emmanuele Battista, Mattia Manfredonia and Gennaro MieleEur. Phys. J. Plus, 132 12 (2017) 537DOI: https://doi.org/10.1140/epjp/i2017-11799-6