On the supersymmetric extension of asymptotic symmetries in three spacetime dimensions Ricardo Caroca, Patrick Concha, Octavio Fierro and Evelyn Rodríguez Eur. Phys. J. C, 80 1 (2020) 29 Published online: 11 January 2020 DOI: 10.1140/epjc/s10052-019-7595-5