A new operating mode in experiments searching for free neutron-antineutron oscillations based on coherent neutron and antineutron mirror reflectionsV.V. Nesvizhevsky, V. Gudkov, K.V. Protasov, W.M. Snow and A.Yu. VoroninEPJ Web Conf., 191 (2018) 01005DOI: https://doi.org/10.1051/epjconf/201819101005