A magneto-gravitational trap for studies of gravitational quantum states V. V. Nesvizhevsky, F. Nez, S. A. Vasiliev, E. Widmann, P. Crivelli, S. Reynaud and A. Yu. Voronin Eur. Phys. J. C, 80 6 (2020) 520 Published online: 10 June 2020 DOI: 10.1140/epjc/s10052-020-8088-2